1
NEET 2018
+4
-1
The refractive index of the material of a prism is $$\sqrt 2$$ and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is
A
600
B
450
C
300
D
zero
2
NEET 2018
+4
-1
An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
A
30 cm away from the mirror
B
36 cm away from the mirror
C
30 cm towards the mirror
D
36 cm towards the mirror
3
NEET 2018
+4
-1
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
large focal length and large diameter
D
small focal length and small diameter
4
NEET 2017
+4
-1
A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle $$\theta$$, the spot of the light is found to move through a distance y on the scale. The angle $$\theta$$ is given by
A
$${y \over x}$$
B
$${x \over {2y}}$$
C
$${x \over {y}}$$
D
$${y \over {2x}}$$
EXAM MAP
Medical
NEET