Ray Optics Test

Result

Ray Optics Test - 70

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Weekly Quiz Competition

Question 1
4 / -1

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

A
10 cm

B
2.5 cm

C
5 cm

D
7.5 cm

Solution
Question 2
4 / -1

The focal length of a convex lens depends upon

A
Frequency of the light ray

B
Wavelength of the light ray

C
Both (a) and (b)

D
None of the above

Solution
Question 3
4 / -1

f_vand f_r are the focal lengths of a convex lens for violet and red light respectively and F_vand F_r are the focal lengths of a concave lens for violet and red light respectively, then

A
f_v< f_r and F_v> F_r

B
f_v< f_r and F_v< F_r

C
f_v> f_r and F_v> F_r

D
f_v> f_r and F_v< F_r

Solution
Question 4
4 / -1

If a lens is cut into two pieces perpendicular to the principal axis and only one part is used, the intensity of the image

A
Remains same

B
1/2 times

C
2 times

D
Infinite
Question 5
4 / -1

Two thin lenses whose powers are +2D and –4D respectively combine, then the power of combination is

A
–2D

B
+2D

C
–4D

D
+4D

Solution
Question 6
4 / -1

A substance is behaving as convex lens in air and concave in water, then its refractive index is

A
Smaller than air

B
Greater than both air and water

C
Greater than air but less than water

D
Almost equal to water
Question 7
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 8
4 / -1

A double convex lens of glass of μ = 1.5 has radius of curvature of each of its surface is 0.2 m. The power ofthe lens is

A
+ 10 dioptres

B
– 10 dioptres

C
– 5 dioptres

D
+ 5 dioptres

Solution
Question 9
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 10
4 / -1

A double convex thin lens made of glass of refractive index 1.6 has radii of curvature 15 cm each. The focal length of this lens when immersed in a liquid ofrefractive index 1.63 is

A
–407 cm

B
250 cm

C
125 cm

D
25 cm

Solution