The phenomenon of light passing through the object is called:
- AReflection
- BRefraction
- CDispersion
- DTotal internal reflection
The phenomenon of light passing through the object is called:
Explanation:
The phenomena when light passes through the object (a medium) is known as refraction. Refraction is defined as the bending of light ray when it passes from one medium to another.

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Focal length of a converging lens in air is R. If it is dipped in water of refractive index 1.33, then its focal length will be around (Refractive index of lens material is 1.5)
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(a) R |
(b) 2R |
(c) 4R |
(d) R / 2 |
If the central portion of a convex lens is wrapped in black paper as shown in the figure
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(a) No image will be formed by the remaining portion of the lens |
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(b) The full image will be formed but it will be less bright |
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(c) The central portion of the image will be missing |
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(d) There will be two images each produced by one of the exposed portions of the lens |
A beam of light of wavelength λ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then
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(a) N ∝ L and E ∝ L |
(b) N ∝ L and E ∝ |
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(c) N ∝ |
(d) N ∝ |
V-i graphs for parallel and series combination of two identical resistors are as shown in figure. Which graph represents parallel combination
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(a) A |
(b) B |
(c) A and B both |
(d) Neither A nor B |
A metallic solid sphere is placed in a uniform electric field. The lines of force follow the path(s) shown in figure as
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(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current
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(a) 1.1 mA |
(b) 1.01 mA |
(c) 0.01 mA |
(d) 10 mA |