Ray Optics Test

Result

Ray Optics Test - 148

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. If this telescope is used to see a 50 meter tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens?

A
5 cm

B
10 cm

C
1 cm

D
2 cm

Solution
Question 2
4 / -1

If F₀ and F_e are the focal length of the objective and eyepiece respectively of a telescope, then its magnifying power will be

A

B

C

D
Question 3
4 / -1

An astronomical telescope has objective and eyepiece lens of powers 0.5 D and 20 D respectively, its magnifying power will be

A
8

B
20

C
30

D
40

Solution
Question 4
4 / -1

The diameter of the objective of the telescope is 0.1 metre and wavelength of light is 6000 Å. Its resolving power would be approximately

A
7.32 × 10^–6 rad

B
1.36 × 10⁶ rad

C
7.32 × 10^–5 rad

D
1.36 × 10⁵ rad

Solution
Question 5
4 / -1

A photograph of the moon was taken with telescope. Later on, it was found that a housefly was sitting on the objective lens of the telescope. In photograph

A
The image of housefly will be reduced

B
There is a reduction in the intensity of the image

C
There is an increase in the intensity of the image

D
The image of the housefly will be enlarged
Question 6
4 / -1

For a telescope to have large resolving power the

A
Focal length of its objective should be large

B
Focal length of its eye piece should be large

C
Focal length of its eye piece should be small

D
Aperture of its objective should be large

Solution
Question 7
4 / -1

The resolving power of an astronomical telescope is 0.2 seconds. If the central half portion of the objective lens is covered, the resolving power will be

A
0.1 sec

B
0.2 sec

C
1.0 sec

D
0.6 sec

Solution
Question 8
4 / -1

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order

A
10⁶ rad

B
10^–2 rad

C
10^–4 rad

D
10^–6 rad

Solution
Question 9
4 / -1

For a compound microscope, the focal lengths of object lens and eye lens are f₀ and f_e respectively, then magnification will be done by microscope when

A
f₀ = f_e

B
f₀>f_e

C
f₀e

D
None of these

Solution
Question 10
4 / -1

To increase the magnifying power of telescope (f₀ = focal length of the objective and f_e = focal length of the eye lens)

A
f₀ should be large and f_e should be small

B
f₀ should be small and f_e should be large

C
f₀ and f_e both should be large

D
f₀ and f_e both should be small

Solution