1
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.
2
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 ____.
3
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 _____.
4
JEE Main 2020 (Online) 4th September Evening Slot
Numerical
+4
-0
The distance between an object and a screen is 100 cm. A lens can produce real image of the object on the screen for two different positions between the screen and the object. The distance between these two positions is 40 cm. If the power of the lens is close to $$\left( {{N \over {100}}} \right)D$$ where N is an integer, the value of N is _________.
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