The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order of
106 rad
10-2 rad
10-4 rad
10-6 rad
The refractive index of the material of the prism is √3, then the angle of minimum deviation of the prism is
30°
45°
60°
75°
Which of the following phenomena exhibits particles nature of light?
Interference
Diffraction
Polarisation
multiple total internal reflections
Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index of 1.25 will be
10 cm
2.5 cm
5 cm
7.5 cm
If fv and fn are the focal lengths of a convex lens for violet ad red light respectively and FV and FR are the focal lengths of concave lens for violet and red light respectively, then we have
fV < fR and FV > FR
fV < fR and FV < FR
fV > fR and FV > FR
fV > fR and FV < FR
Interference is possible in
light waves only
sound waves only
Both light and sound waves
Neither light nor sound waves
Electromagnetic radiation of frequency v , velocity v and wavelength λ, in air enters a glass slab of refractive index μ. The frequency, wavelength and velocity of light in the glass slab will be, respectively
A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in diopters of the combination is
infinite
A planoconvex lens is made of material of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
50 cm
100 cm
200 cm
400 cm
Rainbows are formed by
reflection and diffraction
refraction and scattering
dispersion and total internal reflection
interference only
