1
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
A Young's double-slit experiment is performed using monochromatic light of wavelength $$\lambda$$. The intensity of light at a point on the screen, where the path difference is $$\lambda$$, is K units. The intensity of light at a point where the path difference is $${\lambda \over 6}$$ is given by $${{nK} \over {12}}$$, where n is an integer. The value of n is __________.
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 beam of electrons of energy E scatters from a target having atomic spacing of 1 $$\mathop A\limits^o$$. The first maximum intensity occurs at $$\theta$$ = 60o. Then E (in eV) is ______.
(Planck constant h = 6.64 × 10–34 Js,
1 eV = 1.6 × 10–19 J, electron
mass m = 9.1 × 10–31 kg)
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 _____.
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