Assertion ` :` By increasing the diameter of the objective of telescope, we can increase its range.
Reason `:` The range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope.

Options

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 assertion and reason both are false.

Answer

B

Explanation

The light gathering power (or brightness) of a telescope `prop(` diameter `)^(2)`. So by increasing the objective diameter even far off stars may produce images of optimum brightness.