Question

C4. Multiple Choice Questions (MCQs): Choose the correct answer for each of the following.
1. On increasing the angle between the two reflecting surfaces, the number of images
(a) decreases
(b) increases
(c) does not change.
(d) none of these
2. According to the 2nd law of reflection, the angle of incidence is equal to the
(a) 0°. (b) angle of refraction. (c) angle of reflection. (d) 180°
3. The number of images formed when the angle between two mirrors is 24° is
(a) 18.
(b) 20.
(c. 16.
(d) 14.
4. When the ciliary muscles relax, the thickness of the lens
(a) increases
(b) reduces.
(c) remains the same.
(d) sometimes reduces and sometimes increases.
5. The image of an object is retained on the retina for about
(a) one-sixteenth of a second.
(b) one-fifteenth of a second
(c) one-seventeenth of a second.
(d) one-tenth of a second
6. A man is suffering from myopia. Which of the following statements holds true for him?
(a) He can correct this defect by using convex lenses.
(b) He is not able to see the nearby objects clearly.
(c) This defect can only be treated surgically or through laser.
(d) He wears spectacles with concave lenses of appropriate focal length​

Answer 1

1. a) decreases
2. c) angle of reflection
3. a) 18
4. b) reduces
5. a) 1/16th of a second
6. d) he wears spectacles with concave lens of appropriate focal length