Which one of the following is not due to total internal reflection?
Options
(a) working of optical fibre (b) Difference between apparent and real depth of pond (c) Mirage on hot summer days […]
An object is 8 cm high. It is desired to form a real image 4 cm high at 60 cm from the mirror. The type of mirror needed with the focal length is
Options […]
A ray of light travelling in a transparent medium of refractive index µ, falls on surface seperating the medium from air at an angle of incidence of 45⁰. For which of the following value of […]
For a normal eye, the cornea of eye provides a converging power 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distance between […]
A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is 1.39 x 10⁹ m […]
Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial. The power of the combination is:
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(a) √ f₁ / f₂ (b) √ f₂ / f₁ (c) f₁ […]
Diameter of the objective of a telescope is 200 cm. What is the resolving power of a telescope? Take wavelength of light=5000Å.
Options
(a) 6.56×10⁶ (b) 3.28×10⁵ (c) 1×10⁶ (d) 3.28×10⁶
Correct Answer:
3.28×10⁶
An astronomical telescope arranged for normal adjustment has a magnification of 6. If the length of the telescope is 35 cm, then the focal lengths of objective and eye-piece rspectively, are
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(a) […]
The intermediate image formed by the objective of a compound microscope is
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(a) real, inverted and magnified (b) real, erect and magnified (c) virtual, erect and magnified (d) virtual, inverted and magnified
Correct […]
Astigmatism is corrected by using
Options
(a) cylindrical lens (b) plano-convex lens (c) plano-concave lens (d) convex lens
Correct Answer:
cylindrical lens
Explanation:
In this defect, eye cannot perpendicular directions clearly that is horizontal […]
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