Ray Optics Test

Result

Ray Optics Test - 91

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Weekly Quiz Competition

Question 1
4 / -1

If the red light is replaced by blue light illuminating the object in a microscope the resolving power of themicroscope

A
Decreases

B
Increases

C
Gets halved

D
Remains unchanged

Solution
Question 2
4 / -1

Two points separated by a distance of 0.1 mm can just be resolved in a microscope when a light of wavelength 6000 Å is used. If the light of wavelength 4800 Å isused this limit of resolution becomes

A
0.08 mm

B
0.10 mm

C
0.12 mm

D
0.06 mm

Solution
Question 3
4 / -1

The angular magnification of a simple microscope can be increased by increasing

A
Focal length of lens

B
Size of object

C
Aperture of lens

D
Power of lens

Solution
Question 4
4 / -1

Wavelength of light used in an opticalinstrument are λ₁. = 4000 Å and λ₂ = 5000 Å, then ratio of their respective resolving power (corresponding to λ₁ and λ₂) is

A
16 : 25

B
9 : 1

C
4 : 5

D
5 : 4

Solution
Question 5
4 / -1

The separation between two microscopic particles is measured P_A and P_B by two different lights of wavelength 2000 Å and 3000 Å respectively, then

A
P_A>P_B

B
P_AB

C
P_A<3/2P_B

D
P_A = P_B

Solution
Question 6
4 / -1

Which of the following is not correct regarding the radio telescope?

A
It cannot work at night

B
It can detect a very faint radio signal

C
It can be operated even in cloudy weather

D
It is much cheaper than optical telescope
Question 7
4 / -1

A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focused on a distant object is such a way that parallel rays come out from the eye lens. If the object subtends an angle 2° at the objective, the angular widthof the image

A
10°

B
24°

C
50°

D
1/6°

Solution
Question 8
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 9
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
Question 10
4 / -1

Relative difference of focal lengths of objective and eye lens in the microscope and telescope is given as

A
It is equal in both

B
It is more in telescope

C
It is more in microscope

D
It may be more in any one

Solution