Ray Optics Test

Result

Ray Optics Test - 16

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Weekly Quiz Competition

Question 1
4 / -1

An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distance are measured by

A
a vernier scale provided on the microscope

B
a standard laboratory scale

C
a meter scale provided on the microscope

D
a screw gauge provided on the microscope
Question 2
4 / -1

The head lights of a jeep are 1.2 m apart. If the pupil of the eye of an observer has a diameter of 2 mm and light of wavelength 5896 Å is used, what should be the maximum distance of the jeep from the observer if the two head lights are just separated?

A
33.9 km

B
33.9 m

C
3.34 km

D
3.39 m

Solution
Question 3
4 / -1

What cause chromatic aberration?

A
Non-paraxial rays

B
Paraxial rays

C
Variation of focal length with colour

D
Difference in radii of curvature of the bounding surface of the lens
Question 4
4 / -1

In Huygen's eye piece

A
the cross wires are outside the eyepiece

B
condition for achromatism is satisfied

C
condition for minimum spherical aberration is not satisfied

D
the image formed by the objective is a virtual image
Question 5
4 / -1

For compound microscope f_o =1 cm, f_e = 2.5 cm. An object is placed at distance 1.2 cm from object lens. What should be length of microscope for normal adjustment?

A
8.5 cm

B
8.3 cm

C
6.5 cm

D
6.3 cm

Solution
Question 6
4 / -1

Two convex lenses of focal lengths 0.03 m and 0.05 m are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is

A
0.35 cm

B
0.25 cm

C
0.175 m

D
0.15 m

Solution
Question 7
4 / -1

The magnification produced by the objective lens and the eye lens of a compound microscope are 25 and 6 respectively. The magnification of this microscope is

A
25

B
50

C
150

D
200
Question 8
4 / -1

Identify the wrong description of the below figures

A
1 represents far–sightedness

B
2 correction for short–sightedness

C
3 represents far–sightedness

D
4 correction for far–sightedness
Question 9
4 / -1

A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification, if an object is kept at a distance of 5 cm from the objective, so that final image is formed at the least distance of distinct vision 20 cm.

A
12

B
11

C
10

D
13
Question 10
4 / -1

Two point white does are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye? [take wavelength of light = 500 nm]

A
5 m

B
1 m

C
6 m

D
3 m

Solution