WB JEE 2017 | Geometrical Optics Question 22 | Physics

A point object is held above a thin equiconvex lens at its focus. The focal length is 0.1 m and the lens rests on a horizontal thin plane mirror. The final image will be formed at

infinite distance above the lens

0.1 m above the center of the lens

infinite distance below the lens

0.1 m below the center of the lens

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

WB JEE 2017 Physics - Geometrical Optics Question 20 English

A parallel beam of light is incident on a glass prism in the shape of a quarter cylinder of radius R = 0.05 m and refractive index n = 1.5, placed on a horizontal table as shown in the figure. Beyond the cylinder, a patch of light is found whose the nearest distance x from the cylinder is

$$(3\sqrt 3 - 4) \times {10^{ - 2}}$$ m

$$(2\sqrt 3 - 2) \times {10^{ - 2}}$$ m

$$(3\sqrt 5 - 5) \times {10^{ - 2}}$$ m

$$(3\sqrt 2 - 3) \times {10^{ - 2}}$$ m

WB JEE 2016

MCQ (Single Correct Answer)

-0.25

A ray of light strikes a glass plate at an angle of 60$$^\circ$$. If the reflected and refracted rays are perpendicular to each other, the refractive index of glass is

$${{\sqrt 3 } \over 2}$$

$${3 \over 2}$$

$${1 \over 2}$$

$${\sqrt 3 }$$

WB JEE 2016

MCQ (Single Correct Answer)

-0.25

Light travels through a glass plate of thickness t and having refractive index $$\mu$$. If c be the velocity of light in vacuum, time taken by the light to travel through this thickness of glass is

$${t \over {\mu c}}$$

$${{tc} \over \mu }$$

$${{\mu t} \over c}$$

$$\mu \,tc$$

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