Ray Optics Test

Result

Ray Optics Test - 128

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Weekly Quiz Competition

Question 1
4 / -1

An equiconvex lens of glass of focal length 0.1 metre is cut along a plane perpendicular to principle axis into two equal parts. The ratio of focal length of new lenses formed is

A
1 : 1

B
1 : 2

C
2 : 1

D

Solution
Question 2
4 / -1

The distance between an object and the screen is 100 cm. A lens produces an image on the screen when placed at either of the positions 40 cm apart. The power of the lens is

A
≈ 3 dioptres

B
≈ 5 dioptres

C
≈ 7 dioptres

D
≈ 9 dioptres

Solution
Question 3
4 / -1

A achromatic combination is made with a lens of focal length f and dispersive power ω with a lens having dispersive power of 2ω. The focal length of second will be

A
2 f

B
f/ 2

C
–f/2

D
–2f

Solution
Question 4
4 / -1

A convex lens

A
Converges light rays

B
Diverges light rays

C
Form real images always

D
Always forms virtual images
Question 5
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 6
4 / -1

When a glass lens with n = 1.47 is immersed in a trough of liquid, it looks to be disappeared. The liquid in the trough could be

A
Water

B
Kerosene

C
Glycerin

D
Alcohol

Solution
Question 7
4 / -1

f_vand f_r are the focal lengths of a convex lens for violet and red light respectively and F_v and 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_rand F_v< F_r

C
f_v> f_rand F_v> F_r

D
f_v> f_rand F_v< F_r

Solution
Question 8
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 9
4 / -1

A convex lens of focal length f produces an image 1/n times than that of the size of the object. The distance of the object from the lens is

A
nf

B
f/n

C
–(n + 1) f

D
(n – 1) f

Solution
Question 10
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