JEE Main 2019 (Online) 12th January Evening Slot | Ray & Wave Optics Question 180 | Physics

JEE Main 2019 (Online) 12th January Evening Slot

MCQ (Single Correct Answer)

-1

A plano-convex lens (focal length f₂, refractive index $$\mu $$₂, radius of curvature R) fits exactly into a plano-concave lens (focal length f₁, refractive index $$\mu $$₁, radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal length of the combination will be :

f₁ + f₂

f₁ $$-$$ f₂

$${R \over {{\mu _2} - {\mu _1}}}$$

$${{2{f_1}{f_2}} \over {{f_1} + {f_2}}}$$

JEE Main 2019 (Online) 12th January Evening Slot

MCQ (Single Correct Answer)

-1

Formation of real image using a biconvex lens is shown below :

JEE Main 2019 (Online) 12th January Evening Slot Physics - Ray & Wave Optics Question 180 English

JEE Main 2019 (Online) 12th January Evening Slot Physics - Ray & Wave Optics Question 180 English

If the whole set up is immersed in water without disturbing the object and the screen positions, what will one observe on the screen ?

Image disappears

Magnified image

Erect real image

No change

JEE Main 2019 (Online) 12th January Morning Slot

MCQ (Single Correct Answer)

-1

A light wave is incident normally on a glass slab of refractive index 1.5. If 4 % of light gets reflected and the amplitude of the electric field of the incident light is 30 V/m, then the amplitude of the electric field for the wave propagating in the glass medium will be :

6 V/m

10 V/m

30 V/m

24 V/m

JEE Main 2019 (Online) 12th January Morning Slot

MCQ (Single Correct Answer)

-1

A point source of light, S is placed at distance L in front of the centre of plane mirror of width d which is hanging vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror, at a distance 2L as shown below. The distance over which the man can see the image of the light source in the mirror is

JEE Main 2019 (Online) 12th January Morning Slot Physics - Ray & Wave Optics Question 183 English