A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance
A
50.0 cm
B
54.0 cm
C
37.3 cm
D
46.0 cm
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A beam of light consisting of red, green and blue colours is incifent on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively.
The prism will
A
not separate the three colours at all
B
separate the red colour part from the green and blue colours
C
separate the blue colour part from the red and green colours
D
separate all the three colours from one another
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is $$I$$. The magnification of the telescope is
A
$${{L + I} \over {L - I}}$$
B
$${L \over I}$$
C
$${L \over I} + 1$$
D
$${L \over I} - 1$$
4
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
The refracting angle of a prism is A, and refractive index of the material of the prism is cot (A/2). The angle of minimum deviation is
