Question

a) If both assertion and reason are true and reason is the correct explanation of assertion
b) If both assertion and reason are true but reason is not the correct explanation of assertion
c) if assertion is true but reason is false
d) if both assertion and reason are false

34) Assertion: Two lenses of power -2.5 D and +1.5 D are placed in contact. Then the focal length of the
combination is -1 m
Reason: Power of combination is P= P1 + P2 , Focal length = 1/P
35) Assertion: Tyndall effect is based on atmospheric refraction
Reason: Delayed sunset is due to dispersion of sun light by tiny water droplets, present in the atmosphere.
36) Assertion: A convex lens is also called a converging lens.
Reason: A convex lens always forms real images.

Answer 1

Answer:

34] a

35]c

36] c