1
KCET 2019
MCQ (Single Correct Answer)
+1
-0

A point object is moving uniformly towards the pole of a concave mirror of focal length $$25 \mathrm{~cm}$$ along its axis as shown below. The speed of the object is $$1 \mathrm{~ms}^{-1}$$. At $$t=0$$, the distance of the object from the mirror is $$50 \mathrm{~cm}$$. The average velocity of the image formed by the mirror between time $$t=0$$ and $$t=0.25 \mathrm{~s}$$ is

KCET 2019 Physics - Ray Optics Question 15 English

A
40 cm s$$^{-1}$$
B
20 cm s$$^{-1}$$
C
zero
D
infinity
2
KCET 2019
MCQ (Single Correct Answer)
+1
-0

A certain prism is found to produce a minimum deviation of $$38^{\circ}$$. It produce a deviation of $$44^{\circ}$$ when the angle of incidence is either $$42^{\circ}$$ or $$62^{\circ}$$. What is the angle of incidence when it is undergoing minimum deviation?

A
$$30^{\circ}$$
B
$$40^{\circ}$$
C
$$49^{\circ}$$
D
$$60^{\circ}$$
3
KCET 2018
MCQ (Single Correct Answer)
+1
-0
An object is placed at the principal focus of a convex mirror. The image will be at
A
centre of curvature
B
principal focus
C
infinity
D
no image will be formed
4
KCET 2018
MCQ (Single Correct Answer)
+1
-0
An object is placed at a distance of 20 cm from the pole of a concave mirror of focal length 10 cm . The distance of the image formed is
A
+20 cm
B
+10 cm
C
-20 cm
D
-10 cm
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