WB JEE 2019 | Geometrical Optics Question 15 | Physics

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

A point object is placed on the axis of a thin convex lens of focal length 0.05 m at a distance of 0.2 m from the lens and its image is formed on the axis. If the object is now made to oscillate along the axis with a small amplitude of A cm, then what is the amplitude of oscillation of the image?

[you may assume, $${1 \over {1 + x}} \approx 1 - x$$, where x < < 1]

$${{4A} \over 9} \times {10^{ - 2}}$$ m

$${{5A} \over 9} \times {10^{ - 2}}$$ m

$${A \over 3} \times {10^{ - 2}}$$ m

$${A \over 9} \times {10^{ - 2}}$$ m

WB JEE 2018

MCQ (Single Correct Answer)

-0.25

A point source is placed at coordinates (0, 1) in xy-plane. A ray of light from the source is reflected on a plane mirror placed along the X-axis and perpendicular to the xy-plane. The reflected ray passes through the point (3, 3). What is the path length of the ray from (0, 1) to (3, 3)?

$$\sqrt {13} $$

2$$\sqrt {3} $$

1 + 2$$\sqrt {3} $$

WB JEE 2018

MCQ (Single Correct Answer)

-0.25

WB JEE 2018 Physics - Geometrical Optics Question 11 English

Two identical equiconvex lenses, each of focal length f are placed side by side in contact with each other with a layer of water in between them as shown in the figure. If refractive index of the material of the lenses is greater than that of water, how the combined focal length F is related to f?

F > f

$${f \over 2} < F < f$$

$$F < {f \over 2}$$

F = f

WB JEE 2018

MCQ (Single Correct Answer)

-0.25

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

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