1
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
A point source of light S, placed at a distance 60cm in front of the centre of a plane mirror of width 50 cm, hangs vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 1.2 m from it (see in the figure). The distance between the extreme points where he can see the image of the light source in the mirror is __________ cm.

2
JEE Main 2021 (Online) 25th February Morning Shift
Numerical
+4
-1
The same size images are formed by a convex lens when the object is placed at 20 cm or at 10 cm from the lens. The focal length of convex lens is __________ cm.
3
JEE Main 2020 (Online) 5th September Evening Slot
Numerical
+4
-0
A prism of angle A = 1o has a refractive index $$\mu$$ = 1.5. A good estimate for the minimum angle of deviation (in degrees) is close to $${N \over {10}}$$.
Value of N is ____.
4
JEE Main 2020 (Online) 5th September Morning Slot
Numerical
+4
-0
A compound microscope consists of an objective lens of focal length 1 cm and an eyepiece of focal length 5 cm with a separation of 10 cm.
The distance between an object and the objective lens, at which the strain on the eye is minimum is $${n \over {40}}$$ cm. The value of n is _____.