WB JEE 2018 | Geometrical Optics Question 19 | Physics

There is a small air bubble at the centre of a solid glass sphere of radius r and refractive index $$\mu$$. What will be the apparent distance of the bubble from the centre of the sphere, when viewed from outside?

$${r \over \mu }$$

$$r\left( {1 - {1 \over \mu }} \right)$$

Zero

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

The ratio of the diameter of the sun to the distance between the earth and the sun is approximately 0.009. The approximate diameter of the image of the sun formed by concave spherical mirror of radius of curvature 0.4 m is

4.5 $$ \times $$ 10^$$-$$6 m

4.0 $$ \times $$ 10^$$-$$6 m

3.6 $$ \times $$ 10^$$-$$3 m

1.8 $$ \times $$ 10^$$-$$3 m

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

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

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