The reddish appearance of the sun at sunrise and sunset is due to
The reddish appearance of the sun at sunrise and sunset is due to
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(a) the colour of the sky (b) the scattering of light (c) the polarisation of light (d) the colour […]
Ray Optics
For the normal eye, the cornea of eye provides a converging power of 40D
For the normal eye, the cornea of eye provides a converging power of 40D and the least converging power of the eye lens behind the cornea is 20D. Using this information, the distance between the […]
The radius of curvature of the convex face of a plano-convex lens is 12 cm
The radius of curvature of the convex face of a plano-convex lens is 12 cm and the refractive index of the material of the lens is 1.5. Then, the focal length of the lens is […]
Radii of curvature of a converging lens are in the rato 1:2. Its focal length
Radii of curvature of a converging lens are in the ratio 1:2. Its focal length is 6 cm and refractive index is 1.5. Then, its radii of curvature are ………… respectively
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(a) […]
The magnifying power of a telescope is 9. When it is adjusted for parallel rays
The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are:
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(a) […]
The magnifying power of the astronomical telescope for normal adjustment is 50.
The magnifying power of the astronomical telescope for normal adjustment is 50. The focal length of the eyepiece is 2 cm. The rquired length of the telescope for normal adjustment is
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(a) […]
A small angled prism of refractive index 1.4 is combined with another small angled prism
A small angled prism of refractive index 1.4 is combined with another small angled prism of refractive index 1.6 to produce dispersion without deviation. If the angle of first prism is 6⁰, then the angle […]
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts a plane sheet of glass. This implies that the liquid must have refractive index
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(a) […]
The distance of the moon form the earth is 3.8×10⁵ km. Supposing that the eye
The distance of the moon form the earth is 3.8×10⁵ km. Supposing that the eye is most sensitive to the light of wavelength 550 nm, the seperation of two points on the moon that can […]
A person has a minimum distance of distinct vision as 50 cm. The power of lenses
A person has a minimum distance of distinct vision as 50 cm. The power of lenses required to read a book at a distance of 25 cm is
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(a) 3 D (b) […]