Ray Optics Test

Result

Ray Optics Test - 129

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Weekly Quiz Competition

Question 1
4 / -1

A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a

A
Convex mirror of focal length 10 cm

B
Concave mirror of focal length 40 cm

C
Concave mirror of focal length 60 cm

D
Concave mirror of focal length 10 cm

Solution
Question 2
4 / -1

A combination of two thin lenses of the same material with focal lengths f₁ and f₂, arranged on a common axis minimizes chromatic aberration, if the distance between them is

A

B

C

D
Question 3
4 / -1

The focal length of the field lens (which is an achromatic combination of two lenses) of telescope is 90 cm. The dispersive powers of the two lenses in the combination are 0.024 and 0.036. The focal lengths of two lenses are

A
30 cm and 60 cm

B
30 cm and – 45 cm

C
45 cm and 90 cm

D
15 cm and 45 cm

Solution
Question 4
4 / -1

A lens of focal power 0.5 D is

A
A convex lens of focal length 0.5 m

B
A concave lens of focal length 0.5 m

C
A convex lens of focal length 2 m

D
A concave lens of focal length 2 m

Solution
Question 5
4 / -1

If the focal length of a double convex lens for red lightis f_R, its focal length for the violet light is

A
f_R

B
Greater than f_R

C
Less than f_R

D
2 f_R

Solution
Question 6
4 / -1

A thin equiconvex lens is made of glass of refractive index 1.5 and its focal length is 0.2 m, if it acts as a concave lens of 0.5 m focal length when dipped in a liquid, the refractive index of the liquid is

A
17/8

B
15/8

C
13/8

D
9/8

Solution
Question 7
4 / -1

Chromatic aberration of lens can be corrected by

A
Reducing its aperature

B
Proper polishing of its two surfaces

C
Suitably combining it with another lens

D
Providing different suitable curvature to its two surfaces
Question 8
4 / -1

An object is placed at a distance of 10 cm from a convex lens of power 5D. Find the position of the image

A
–20 cm

B
30 cm

C
20 cm

D
–30 cm

Solution
Question 9
4 / -1

In a plano-convex lens the radius of curvature of the convex lens is 10 cm. If the plane side is polished, then the focal length will be (Refractive index = 1.5)

A
10.5 cm

B
10 cm

C
5.5 cm

D
5 cm

Solution
Question 10
4 / -1

The focal length of a convex lens is 10 cm and its refractive index is 1.5. If the radius of curvature of one surface is 7.5 cm, the radius of curvature of the second surface will be

A
7.5 cm

B
15.0 cm

C
75 cm

D
5.0 cm

Solution