Ray Optics Test

Result

Ray Optics Test - 30

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Weekly Quiz Competition

Question 1
4 / -1

The resolution limit of the eye is 1 minute. At a distance x km from the eye, two persons stand with a lateral separation of 3 km. For the two persons to be just resolved by the naked eye, x should be

A
10 km

B
15 km

C
20 km

D
30 km

Solution
Question 2
4 / -1

Ray optics is valid, when characteristic dimensions are

A
of the same order as the wavelength of light

B
much smaller than the wavelength of light

C
of the order of one millimetre

D
much larger than the wavelength of light
Question 3
4 / -1

The image of a star (effectively a point source) is made by convergent lens of focal length 50 cm and diameter of aperture 5.0 cm. If the lens is ideal, and the effective wavelength in image formation is taken as 5 × 10^–5 cm, the diameter of the image formed will be nearest to

A
Zero

B
10^–6 cm

C
10^–5 cm

D
10^–3 cm

Solution
Question 4
4 / -1

Light travels through a glass plate of thickness t and having a refractive index µ. If c is the velocity of light in vacuum, the time taken by light to travel this thickness of glass is

A
t µ c

B
tc/µ

C
t/µc

D
µ t/c

Solution
Question 5
4 / -1

Two thin lenses of focal length f ₁ and f₂ are placed coaxially in contact. The combination acts as a single lens of focal length

A

B

C

D

Solution
Question 6
4 / -1

A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens a convex mirror of radius of curvature 10 cm be placed in order to have an inverted image of the object coincident with it?

A
12 cm

B
30 cm

C
50 cm

D
60 cm

Solution
Question 7
4 / -1

A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be

A
10 cm

B
15 cm

C
20 cm

D
30 cm

Solution
Question 8
4 / -1

If the refractive index of a material of equilateral prism is √3 , then angle of minimum deviation of the prism is

A
30º

B
45º

C
60º

D
75º

Solution
Question 9
4 / -1

An object of height 1.5 cm is placed on the axis of a convex lens of focal length 25 cm. A real image is formed at a distance of 75 cm from the lens. The size of image will be

A
4.5 cm

B
3.0 cm

C
0.75 cm

D
5 cm

Solution
Question 10
4 / -1

An equiconvex lens of glass of focal length 0.1 m is cut along a plane perpendicular to principal 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
2 : 1/2

Solution