Identify the mismatch in the following
Myopia — Concave lens
For rear view — Concave mirror
Hypermetropia — Convex lens
Astigmatism — Cylindrical lens
The focal lengths of the objective and the eyepiece of the telescope are 225 cm and 5 cm respectively. The magnifying power of the telescope will be
49
45
35
60
The angle of incidence for an equilateral prism of refractive index so that the ray is parallel to the base inside the prism is
30°
20°
60°
45°
C.
60°
According to Rayleigh scattering law, the amount of scattering is
directly proportional to wavelength of light
directly proportional to square of wavelength of light
inversely proportional to fourth power of wavelength of light
inversely proportional to wavelength of light
An object is kept at a distance of 60 cm from a concave mirror. For getting a magnification of , focal length of the concave mirror required is
20 cm
40 cm
− 20 cm
30 cm
If the speed of light in material A is 1.25 times its speed in material B, then the ratio of the refractive indices of these materials is
1.50
1.00
0.800
1.25
The resolving power of a microscope is
inversely proportional to numerical aperture
directly proportional to wavelength
directly proportional to square of the wavelength
directly proportional to numerical aperture.
The focal length of the lens of refractive index (µ = 1.5) in air is 10 cm. If air is replaced by water of , its focal length is
20 cm
30 cm
40 cm
25 cm
A beam of natural light falls on a system of 5 polaroids, which are arranged in succession such that the pass axis of each polaroid is turned through 60° with respect to the preceding one. The fraction of the incident light intensity that passes through the system is
A glass prism of refractive index 1.5 is immersed in water . Refer figure.
A light beam incident normally on the face AB is totally reflected to reach the face BC, if
2/3 < sin θ < 8/9
sin θ ≤ 2/3
cos θ ≥ 8/9
sin θ > 8/9