1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A plane glass mirror of thickness 3 cm of material of $$\mu=\frac{3}{2}$$ is silvered on the black surface. When a point object is placed 9 cm from the front surface of the mirror, then the position of the brightest image from the front surface is

A
9 cm
B
11 cm
C
12 cm
D
13 cm
2
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Two converging lenses of focal length 20 cm and 40 cm are placed in contact. The effective power of the combination is

A
5.25 D
B
7.25 D
C
2.75 D
D
7.5 D
3
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm. The focal length of lenses are

A
10 cm, 10 cm
B
15 cm, 5 cm
C
18 cm, 2 cm
D
11 cm, 9 cm
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A convex lens is made of 3 layers of glass of 3 different materials as in the figure.

COMEDK 2020 Physics - Ray Optics Question 18 English

A point object is placed on its axis. The number of images of the object are

A
3
B
4
C
1
D
2
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