JEE Main 2017 (Online) 8th April Morning Slot | Geometrical Optics Question 240 | Physics

Let the refractive index of a denser medium with respect to a rarer medium be n₁₂ and its critical angle be θ_C . At an angle of incidence A when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is 90^o. Angle A is given by :

$${1 \over {{{\cos }^{ - 1}}\left( {\sin {\theta _C}} \right)}}$$

$${1 \over {{{\tan }^{ - 1}}\left( {\sin {\theta _C}} \right)}}$$

$${\cos ^{ - 1}}\,\left( {\sin {\theta _C}} \right)$$

$${\tan ^{ - 1}}\,\left( {\sin {\theta _C}} \right)$$

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MCQ (Single Correct Answer)

-1

A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15cm from a converging lens of magnitude of focal length 20cm. A beam of parallel light falls on the diverging lens. The final image formed is:

real and at a distance of 6 cm from the convergent lens.

real and at a distance of 40 cm from convergent lens.

virtual and at a distance of 40 cm from convergent lens.

real and at a distance of 40 cm from the divergent lens.

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are :

Two

Three

Four

Five

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

A hemispherical glass body of radius 10 cm and refractive index 1.5 is silvered on its curved surface. A small air bubble is 6 cm below the flat surface inside it along the axis. The position of the image of the air bubble made by the mirror is seen :

JEE Main 2016 (Online) 10th April Morning Slot Physics - Geometrical Optics Question 235 English