JEE Main 2019 (Online) 9th January Evening Slot | Ray & Wave Optics Question 194 | Physics

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

In a Young's double slit experiment, the slits are placed 0.320 mm apart. Light of wavelength $$\lambda $$ = 500 nm is incident on the slits. The total number of bright fringes that are observed in the angular range $$-$$ 30^o$$ \le $$$$\theta $$$$ \le $$30^o is :

640

320

321

641

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror (M₁) and parallel to the second mirror (M₂) is finally reflected from the second mirror (M₂) parallel to the first mirror (M₁). The angle between the two mirrors will be :

45^o

60^o

75^o

90^o

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is :

1.1 cm away from the lens

0.55 cm towards the lens

0.55 cm away from the lens

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

Consider a tank made of glass(refractive index 1.5) with a thick bottom. It is filled with a liquid of refractive index $$\mu $$. A student finds that, irrespective of what the incident angle i (see figure) is for a beam of light entering the liquid, the light reflected from the liquid glass interface is never completely polarized. For this to happen, the minimum value of $$\mu $$ is :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Ray & Wave Optics Question 196 English