If the lens diameter is doubled, what happens to the resolvable angle of images produced at fixed wavelength? a. the angle decreases by a factor of two. b. the angle increases by a factor of four. c. the angle stays the same. d. the angle decreases by a factor of four. e. the angle increases by a factor of two.

Option A

Explanation:

Angular resolution for any optical equipment can be defined as the ability of that tool to differentiate the smallest details of the image formed.

The angular resolution is given by:

                  (1)

where

= Angular Resolution

= wavelength

d = diameter of the lens

Now,

As per the question:

If the diameter of the lens is doubled, i.e., d' = 2d

Then

From eqn (1):

Thus when the diameter is doubled the angular resolution becomes half of its original value.

a electromagnetic waves

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg