How will be resolving power of a microscope be changed, if -(a) the wavelength of the incident light decreases (b) diameter of the objective lens decreases? Give reasons, in support of your answer.

How does the resolving power of a microscope depend on (i) the wavelength of the light used and (ii) the medium used between the object and the objective lens?

What is the effect on the velocity of the emitted photoelectrons if the wavelength of the incident light is decreased?

Three different numbers a, b, c are both in A.P. G.P. - is it possible ? Give reasons in support of your answer.

What will be the effect on the velocity of emitted photo-electron if the wavelength of incident light is gradually decreased?

If the diameter of the objective of a telescope is doubled, how will its resolving power change?

An isosceles triangle is made of three zinc rods. Will there be any change in its base angles with the rise in temperature? Give reasons for your answer.

Two unbiased dice are thrown .Let A be the event that the sum of the digits shown on the two dice is 5 and B be the event that at least one of the dice shows up a 5. Are the two events i. mutually exclusice? (ii) exhaustive? Give arguments in support of your answer.

If the average distance between the sun and the earth decreases for some reason , then state whether the length of a year will increase or decrease. Give the reason for your answer .