A thin equiconvex lens of refractive index 3/2 and radius of curvature 30 cm
A thin equiconvex lens of refractive index 3/2 and radius of curvature 30 cm is put in water (refractive index = 4/3) , its focal length is
Options
(a) 0.15 m (b) 0.30 […]
Ray Optics
An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp
An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp image is formed on a screen. Now, a concave lens is placed in contact with the […]
A glass slab consists of thin uniform layers of progressively decreasing refractive
A glass slab consists of thin uniform layers of progressively decreasing refractive indices refractive index such that the refractive index of any layer is μ-m∆μ. Here μ and ∆μ denote the refractive index of 0th […]
If μᵥ=1.5230 and μʀ=15.145, then dispersive power of crown glass is
If μᵥ=1.5230 and μʀ=15.145, then dispersive power of crown glass is
Options
(a) 0.0164 (b) 0.00701 (c) 0.0132 (d) 0.032
Correct Answer:
0.0164
Explanation:
Here μᵥ=1.5230and μʀ=1.5145
Therefore, mean refractive index, μ =(1.523+1.5145) /2 […]
A person cannot see the objects clearly placed at a distance more than 40 cm
A person cannot see the objects clearly placed at a distance more than 40 cm. He is advised to use a lens of power
Options
(a) -2.5 D (b) 2.5 D (c) -6.25 […]
If the red light is replaced by blue light illuminating the object in a microscope
If the red light is replaced by blue light illuminating the object in a microscope, the resolving power of the microscope
Options
(a) decreases (b) increases (c) gets halved (d) remains unchanged
Correct […]
A Galilean telescope has an objective of focal length 100 cm and magnifying power 50
A Galilean telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal adjustment will be
Options
(a) 96 cm (b) 98 cm […]
When the angle of incidence is 60° on the surface of a glass slab, it is found
When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is
Options
(a) √2 […]
A ray of light is incident on a transparent glass slab of refractive index 1.62
A ray of light is incident on a transparent glass slab of refractive index 1.62. The reflected and refracted rays are mutually perpendicular. The angle of incidence is
Options
(a) 58.3° (b) 50° […]
The optical path of a monochromatic light is same if it goes through 4.0 cm
The optical path of a monochromatic light is same if it goes through 4.0 cm of glass or 4.5 cm of water. If the refractive index of glass is 1.53, the refractive index of the […]