An astronomical refracting telescope will have large angular magn… - Vidyadip

MCQ

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

A
small focal length and large diameter
B
large focal length and small diameter
C
small focal length and small diameter
✓
large focal length and large diameter

✓

Answer

Correct option: D.

large focal length and large diameter

d
For telescope, angular magnification $=\frac{f_{0}}{f_{e}}$

Angular resolution $=\frac{D}{1.22 \lambda}$ should be large.

So, objective lens should have large focal length $\left(f_{o}\right)$ and large diameter $D$ for large angular

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

A galvanometer having a coil resistance of $30\,\Omega $ shows full scale deflection when a current of $2\,A$ passes through it. It can be converted into an ammeter to read currents upto $10\,A$ by

Photo cell is a device to

An $X-$ray has a wavelength of $0.010 Å$. Its momentum is

An alternating e.m.f. is applied to purely capacitive circuit. The phase relation between e.m.f. and current flowing in the circuit is orIn a circuit containing capacitance only

The amplitude of a particle executing $SHM$ is $3\,cm$. The displacement at which its kinetic energy will be $25 \%$ more than the potential energy is: $.............cm$.

A truck is stationary and has a bob suspended by a light string, in a frame attached to the truck. The truck, suddenly moves to the right with an acceleration of $a$. The pendulum will the

A square Lamina OABC of length 10 cm is pivoted at ' O '. Forces act at Lamina as shown in figure. If Lamina remains stationary, then the magnitude of F is :

A lamp is hanging at a height of $4\,m$ above a table. The lamp is lowered by $1\,m$. The percentage increase in illuminace will be.....$\%$

Consider the following equation of Bernouilli’s theorem. $P + \frac{1}{2}\rho {V^2} + \rho gh = K$ (constant)The dimensions of $K/P$ are same as that of which of the following

Formation of real image using a biconvex lens is shown below:

If the whole set up is immersed in water without disturbing the object and the screen positions, what will one observe on the screen?