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Preeti Dabral 3 years, 2 months ago
Total power = P1+P2=5-12=-7 D
Total focal length F=100/P=100/-7= -14.28 cm
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having the same or a similar relation; corresponding, as in relative position or structure. corresponding in structure and in origin, but not necessarily in function: The wing of a bird and the foreleg of a horse are homologous. having the same alleles or genes in the same order of arrangement: homologous chromosomes.
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Blue colour of the sky as seen from earth surface is on the account of scattering of light of shorter wavelength by particles present in the atmosphere of the earth. If the earth had no atmosphere, there would not have been any scattering and sky would have looked dark. When an astronaut is in his spacecraft, he is present above the atmosphere of earth, from where the sky appears dark to him because there is no scattering of light there.
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By experimenting with pea plant breeding, Mendel developed three principles of inheritance that described the transmission of genetic traits, before anyone knew genes existed. Mendel's insight greatly expanded the understanding of genetic inheritance, and led to the development of new experimental methods.
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Preeti Dabral 3 years, 2 months ago
Distance of the object ' u '=-20 cm
Image is formed in front of the mirror at a distance (v) of -15 cm
Therefore, the focal length of the mirror ' f ' is
{tex}\begin{aligned} & \Rightarrow \frac{1}{f}=\frac{1}{v}+\frac{1}{u} \\ & \Rightarrow \frac{1}{f}=\frac{1}{-15}+\frac{1}{-20} \\ & \Rightarrow \frac{1}{f}=-\frac{4}{60}-\frac{3}{60}=\frac{-7}{60} \\ & \Rightarrow f=\frac{-60}{7} \mathrm{~cm} \end{aligned}{/tex}
Thus, the mirror is concave and has a focal length of 60 / 7.
(ii) Distance of the object ' u ' =-20cm
Image is formed behind the mirror at a distance (v) of 15 cm
Then, the focal length of the mirror ' f ' will be
{tex}\begin{aligned}
& \frac{1}{f}=\frac{1}{v}+\frac{1}{u} \\
& \Rightarrow \frac{1}{f}=\frac{1}{15}+\frac{1}{-20} \\
& \Rightarrow \frac{1}{f}=\frac{4}{60}-\frac{3}{60}=\frac{1}{60}
\end{aligned}{/tex}
f=60
Thus, the mirror is convex and has a focal length of 60 cm.
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Marsh gas, also known as swamp gas or bog gas, is a mixture primarily of methane and smaller amounts of hydrogen sulfide, carbon dioxide, and trace phosphine that is produced naturally within some geographical marshes, swamps, and bogs
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The prevention of pregnancy in women (by preventing fertilisation) is called contraception. There are four methods of contraception:
- Barrier method: In barrier method of contraception, the physical devices such as condoms are used by males and females.
- Chemical method: In chemical methods of preventing pregnancy, the females use two types of pills – oral pills and vaginal pills.
- Intra-Uterine Contraceptive Devices – The use of intra-uterine contraceptive devices like Copper-T is very effective in preventing pregnancy. A Copper-T is placed inside the uterus by a doctor to prevent unwanted pregnancies.
- Surgical method: These methods are available for males as well as for females. Vasectomy is done in males and tubectomy is done in females.
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The adult hindbrain, or rhombencephalon, is composed of the posteriorly located medulla oblongata, the ventroanteriorly located pons, and the dorsoanteriorly located cerebellum and is densely packed with vital structures.
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