Telescope

Question 1

Nature of image formed by an astronomical telescope

Answer 1

Inverted and real

Question 2

Magnification of astronomical telescope when image is formed at D

Answer 2

M = -fo/fe ( 1 + fe/D)

L= fo + Ue

Question 3

Magnification of astronomical telescope when image is formed at infinity

Answer 3

M = -fo/fe

L = fo + fe

Question 4

Terrestrial telescope ?

Answer 4

It has Conves lex of focal length f between objective and eyepiece and is placed in such a way that it’s distance is 2f from the objective lens

Question 5

Nature of image formed by a terrestrial telescope

Answer 5

Erect

Question 6

Magnification of a terrestrial telescope when image is formed at D

Answer 6

M = fo/fe(1+fe/D)

L= fo + Ue + 4f

Question 7

Magnification of a terrestrial telescope when image is formed at Infinity

Answer 7

M = fo/fe

L = fo + fe + 4f

Question 8

Galilean Telescope

Answer 8

In this telescope the objective is a convex lens

While the eyepiece is a concave lens

Question 9

Nature of image formed by a Galilean telescope

Answer 9

Erect

Question 10

Magnification of a Galilean telescope when image is Formed at D

Answer 10

M = fo/fe ( 1 + D/fe)

L = fo - Ue

Question 11

Magnification of a Galilean telescope when image is Formed at Infinity

Answer 11

M = fo/fe

L = fo - fe

Question 12

Resolving power of a telescope

Answer 12

RP = D/1.22₹

Where
₹- wavelength of incident light