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Lenses can be either convex or concave, with convex lenses focusing light rays at a focal point while concave lenses refract light rays to spread them out. The location and size of an image produced by a lens depends on whether it is convex or concave and how close or far the object is. Lenses are used to correct vision problems like farsightedness and nearsightedness, as well as in optical devices like telescopes and microscopes.
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Light(by aagman saini)
Light can travel through a vacuum and enables us to see. It exhibits rectilinear propagation, reflecting regularly off smooth surfaces and irregularly off rough surfaces. Images can be real, formed by the actual intersection of light rays, or virtual, formed behind a mirror but not by the actual intersection of rays. Spherical mirrors can be concave or convex and have defined optical characteristics. Concave mirrors form enlarged images close to the mirror and diminished ones further away. Convex mirrors always form diminished, erect images. Lenses come in converging and diverging types and also have specific optical properties depending on the position of objects in relation to the focal point.
Microscope
The document discusses the history and components of the microscope. It describes how Antony van Leeuwenhoek is credited with developing the first microscope in the 16th century and discovering bacteria and cells. The main types of microscopes are described as optical, electron, and scanning probe microscopes. Optical microscopes are further divided into simple and compound microscopes. Compound microscopes use two lenses, the objective and eyepiece lenses, to magnify specimens, while simple microscopes use only one lens. The parts of a compound microscope and how it works to produce a magnified image are also outlined.
Optical instruments
Optical instruments like magnifying glasses, cameras, microscopes and telescopes extend the capabilities of the human eye. Magnifying glasses allow close examination of small objects like stamps. Cameras can capture events over time like photojournalists do. Microscopes enable the study of tiny organisms. Telescopes help astronomers observe distant heavenly bodies. These tools use lenses or mirrors to enlarge and clarify images beyond the limits of normal vision.
Refraction and Dispersion of light.pptx
HELLO EVERYONE MY NAME IS DAKSH GUPTA I READ IN CLASS 8 THIS PRESENTATION WILL HELP YOU TO MAKE YOUR OWN PRESENTATION BETTER THAN ME THANK YOU FOR SEEING THIS PRESENTATION
Light and optics notes
An optical device uses light and can be as simple as a mirror or complex like the Hubble Space Telescope. The document discusses the history and workings of microscopes, telescopes, binoculars, lenses, mirrors and light refraction. Key developments include the first microscope invented in the late 16th century leading to microbiology, and the first telescope in the late 17th century revolutionizing astronomy. The basic principles of lenses, mirrors, reflection and refraction are explained through diagrams.
Lens
This document defines and describes lenses, their properties and uses. It explains that lenses are transparent materials that refract light to form images. Convex lenses converge parallel rays while concave lenses diverge them. The principal axis is the line through the lens center. The focal point is where parallel rays converge/diverge after passing through the lens. Focal length is the distance from the lens center to the focal point. The document also discusses how lenses in the eye can cause nearsightedness or farsightedness, and how corrective lenses can remedy vision defects by diverging or converging light appropriately on the retina.
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Frog review
This document provides a diagram labeling various anatomical features of an animal's internal organs and systems, including the location of the vomerine teeth, gullet, internal nares, glottis, maxillary teeth, vocal sacs, eye sockets, tympanic membrane, nictitating membrane, external naris, liver, fat bodies, small intestine, heart, gall bladder, lungs, kidneys, spleen, cloaca, mesentery, stomach, testis, urinary bladder, ovaries, oviduct, and their relative positions.
Chpt.3.1
1) Arthropods undergo either complete or incomplete metamorphosis. Complete metamorphosis involves four stages: egg, larva, pupa, and adult. Incomplete metamorphosis involves hatching from eggs as nymphs and molting into winged adults after several molts.
2) Animals exhibit one of three types of symmetry: asymmetry, radial symmetry, or bilateral symmetry. Radial and bilateral symmetry involve dividing the animal into mirror halves, while asymmetry does not.
3) Succession describes the process of ecological community change over time. There are two types: primary succession colonizes new bare rock and soilless sites, while secondary succession occurs on existing soil after a disturbance like
Chpt.2.3
This document summarizes the cycling of important materials like water, carbon, nitrogen, and phosphorus through ecosystems. It explains that while energy is lost at each trophic level, the sun replenishes it, and matter is recycled as nutrients move through organisms. The atoms that make up living things today have been on Earth since life began. It then provides more detailed explanations of the water, carbon, nitrogen, and phosphorus cycles.
Chpt.2.2
The flow of energy in an ecosystem begins with autotrophs, such as plants, which use energy from the sun to produce their own food through photosynthesis. Heterotrophs, including herbivores, carnivores, omnivores, and decomposers then obtain energy by consuming autotrophs and other organisms. This energy is transferred between trophic levels in a food chain and food web, with less energy being available at higher trophic levels due to energy being lost as heat at each transfer.
Chpt.2.1
Ecology is the scientific study of the interactions between organisms and their environments. It reveals the interrelationships between living (biotic) and nonliving (abiotic) parts of the world. Key concepts in ecology include the biosphere, biotic factors, abiotic factors, levels of organization (organism, population, community, ecosystem, biome, biosphere), habitats, niches, and symbiosis (commensalism, mutualism, parasitism). Ecology combines information from various sciences to understand these relationships.
Chpt. 17.3- Domains and Kingdoms
The document discusses different systems for classifying life into kingdoms and domains. It describes the three domain system of Bacteria, Archaea and Eukarya. It also outlines the six kingdom system of Bacteria, Archaea, Protista, Plantae, Fungi and Animalia. Finally, it mentions the traditional five kingdom system of Monera, Protista, Plantae, Fungi and Animalia. It provides details about the defining characteristics of each domain and kingdom.
Chpt. 17.2 Modern Classification
Cladograms are branching diagrams that represent the proposed evolutionary history of a species or group, with closer branches indicating that organisms have more traits in common. They are a modern method of classification that shows evolutionary relationships rather than just taxonomic rankings.
Chpt. 17.1-History of Classification
Aristotle first classified organisms as either animals or plants, with plants grouped by size and animals by whether they had blood. Linnaeus broadened Aristotle's system and created the first formal taxonomy, grouping organisms into a binominal nomenclature with a genus and species name. The taxonomic categories from most specific to broad are species, genus, family, order, class, phylum, kingdom, and domain.
Chpt.15.2-Evidence of Change
There are several ways that scientists provide evidence of evolution, including comparative anatomy, comparative embryology, and fossils. Comparative anatomy looks at homologous and analogous structures between species, while comparative embryology examines similarities in development. Fossils provide direct evidence of extinct species and how they changed over time. Scientists use both relative dating of fossils layers and radioactive dating to determine the age of fossils and track changes in species. Adaptations like camouflage and mimicry help organisms survive and reproduce more successfully.
Chpt. 15.1
Charles Darwin developed the theory of evolution by natural selection based on his observations as a naturalist aboard the HMS Beagle in the 1830s. While visiting the Galapagos Islands, Darwin noticed that related but distinct animal species inhabited different islands. He later concluded that populations on the mainland evolved over generations as they adapted to their local environments, with better adapted traits being passed down. Darwin's theory proposed that natural selection drives evolution, as organisms better suited to their environment will survive and reproduce, passing on their favorable traits.
Chapter 11.3 notes
A karyotype is a micrograph that arranges homologous chromosome pairs in decreasing size order. It is used to study chromosomes stained during cell metaphase. Nondisjunction is a cell division error where sister chromatids do not separate properly, which can cause conditions like Down syndrome.
Chpt. 11.2 complex inheritance leftovers
Sickle-cell anemia is an autosomal recessive trait common in those with African and Mediterranean ancestry. It causes abnormally shaped red blood cells, impaired blood flow, tissue damage, and health issues. Sex is determined by the 23rd pair of chromosomes - females have XX and males have XY. The X chromosome carries many genes needed for development in both sexes. To compensate for having two X chromosomes, females inactivate one randomly. Sex-linked traits are on the X chromosome and are always expressed if recessive in females. Muscular dystrophy is an X-linked recessive disease. Polygenic traits like skin and eye color are influenced by two or more genes and result in a range of intermediate phenotypes.
Chapter 11.1 notes
This document summarizes several human genetic disorders including their inheritance patterns, symptoms, prevalence, and treatment options. Huntington's disease is an autosomal dominant neurological disorder with onset between 30-50 years of age that is always fatal. Cystic fibrosis is the most common lethal genetic disorder among white Americans, affecting the lungs and digestive system due to thick mucus production, with current treatments improving life expectancy. Tay-Sachs disease causes neurological deterioration and death by age 5 due to fatty acid accumulation in the brain.
Incomplete codominance multiple_alleles
The document discusses different patterns of inheritance beyond simple dominance:
1) Incomplete dominance, where the heterozygous phenotype is intermediate between the homozygous phenotypes. Examples include snapdragons and carnations.
2) Codominance, where both alleles are expressed in the heterozygote rather than blending. Examples include checkered chickens, roan horses, and variegated clover.
3) Multiple alleles, where more than two alleles control a trait. Examples include human blood types and coat colors in rabbits.
10.2 mendelian genetics
Gregor Mendel conducted the first scientific studies of heredity by breeding pea plants. He found that traits are transmitted from parents to offspring through discrete units called alleles. Through his experiments with monohybrid and dihybrid crosses, Mendel established the laws of segregation, dominance, and independent assortment. These laws describe the basic principles of genetic inheritance and provided the foundation for the modern science of genetics.
Chapter 12.4 gene regulation & mutation
This document summarizes gene regulation and mutation. It explains that gene regulation allows organisms to control which genes are transcribed in response to the environment, using operons in prokaryotes. Mutation is a change in the DNA sequence that can cause changes in proteins. There are two main types of mutations: point mutations which substitute a single nucleotide, and frameshift mutations which insert or delete nucleotides, affecting all subsequent amino acids. Mutations can be caused by environmental factors like radiation or chemicals and may be passed to offspring.
Chapter 12.3 dna,rna and protein
DNA contains the genetic code that is transcribed into messenger RNA (mRNA) which is then translated into proteins. There are three main types of RNA - mRNA carries the genetic code from DNA to the ribosome for protein production. Ribosomal RNA (rRNA) helps join mRNA to transfer RNA (tRNA) during protein synthesis. TRNA transports amino acids to the ribosome where they are linked together based on the mRNA codon sequence.
Chapter 12.2 dna replication
DNA replication is a semiconservative process where the parental DNA strands separate and each serves as a template to produce two new DNA molecules, each with one original and one new strand. It occurs in three stages: unwinding, base pairing, and joining. During unwinding, enzymes separate the double helix and add RNA primers. Then, DNA polymerase adds complementary bases to each new strand by matching A-T and C-G. The lagging strand replicates in fragments that are later joined.
Chapter 12.1 molecular genetics
The document summarizes early discoveries about DNA and its structure. Frederick Griffith discovered transformation could occur between bacterial strains. Avery, MacLeod and McCarty showed that DNA was the transforming molecule. Hershey and Chase provided evidence that DNA, not protein, was the genetic material of viruses. Chargaff discovered base pairing rules for DNA. Rosalind Franklin and Maurice Wilkins used X-ray crystallography to study DNA structure. Watson and Crick then proposed the double helix model of DNA structure based on Chargaff's rules and Franklin and Wilkins' research.
Meiosis
Meiosis is a type of cell division that produces gametes, such as sperm and egg cells, with half the normal number of chromosomes. It involves two cell divisions: Meiosis I and Meiosis II. In Meiosis I, homologous chromosomes pair up and separate, reducing the chromosome number by half. Meiosis II then separates the sister chromatids, resulting in four haploid daughter cells each with a single set of chromosomes. This ensures genetic variation and allows for sexual reproduction where gametes from two individuals combine to form a diploid zygote.
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2 lenses
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- 13. Refracting Telescope Reflecting Telescope Microscope