JEE Main Geometrical Optics Practice Questions With Solutions

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JEE Main Physics Geometrical Optics Practice Questions

Question 1.

The following figure represents two biconvex lenses $L_{1}$ and $L_{2}$ having focal length $10 cm$ and $15 cm$ respectively. The distance between $L_{1}$ & $L_{2}$ is :

JEE Main 2024 (Online) 9th April Evening Shift Physics - Geometrical Optics Question 9 English

25 cm

35 cm

10 cm

15 cm

Question 2.

Given below are two statements :

Statement (I) : When an object is placed at the centre of curvature of a concave lens, image is formed at the centre of curvature of the lens on the other side.

Statement (II) : Concave lens always forms a virtual and erect image.

In the light of the above statements, choose the correct answer from the options given below :

Statement I is false but Statement II is true

Both Statement I and Statement II are false

Both Statement I and Statement II are true

Statement I is true but Statement II is false

Question 3.

The position of the image formed by the combination of lenses is :

JEE Main 2024 (Online) 8th April Evening Shift Physics - Geometrical Optics Question 4 English

15 cm

(right of second lens)

30 cm

(right of third lens)

30 cm

(left of third lens)

15 cm

(left of second lens)

Question 4.

Critical angle of incidence for a pair of optical media is $45^{\circ}$ . The refractive indices of first and second media are in the ratio:

1 : 2

1 : \sqrt{2}

2 : 1

\sqrt{2} : 1

Question 5.

For the thin convex lens, the radii of curvature are at $15 cm$ and $30 cm$ respectively. The focal length the lens is $20 cm$ . The refractive index of the material is :

1.2

1.5

1.4

1.8

Question 6.

An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is $25 D$ . Focal length of each of the convex lens is:

50 cm

20 cm

25 cm

500 cm

Question 7.

In an experiment to measure focal length ( $f$ ) of convex lens, the least counts of the measuring scales for the position of object (u) and for the position of image (v) are $Δ u$ and $Δ v$ , respectively. The error in the measurement of the focal length of the convex lens will be:

2 f [\frac{Δ u}{u} + \frac{Δ v}{v}]

f [\frac{Δ u}{u} + \frac{Δ v}{v}]

f^{2} [\frac{Δ u}{u^{2}} + \frac{Δ v}{v^{2}}]

\frac{Δ u}{u} + \frac{Δ v}{v}

Question 8.

The refractive index of a prism with apex angle $A$ is $\cot A / 2$ . The angle of minimum deviation is :

δ_{m} = 180^{\circ} - 3 A

δ_{m} = 180^{\circ} - 4 A

δ_{m} = 180^{\circ} - 2 A

δ_{m} = 180^{\circ} - A

Question 9.

If the distance between object and its two times magnified virtual image produced by a curved mirror is $15 cm$ , the focal length of the mirror must be:

- 10

- 12

15 cm

10/3 cm

Question 10.

A convex mirror of radius of curvature $30 cm$ forms an image that is half the size of the object. The object distance is :

-

45 cm

-

15 cm

45 cm

15 cm

Question 1.

A biconvex lens of refractive index 1.5 has a focal length of $20 cm$ in air. Its focal length when immersed in a liquid of refractive index 1.6 will be:

-

16 cm

+16 cm

+160 cm

-

160 cm

Question 2.

If the refractive index of the material of a prism is $\cot (\frac{A}{2})$ , where $A$ is the angle of prism then the angle of minimum deviation will be

π - 2 A

\frac{π}{2} - 2 A

π - A

\frac{π}{2} - A

Question 3.

Identify the physical quantity that cannot be measured using spherometer :

Radius of curvature of concave surface

Specific rotation of liquids

Thickness of thin plates

Radius of curvature of convex surface

Question 4.

A convex lens of focal length $40 cm$ forms an image of an extended source of light on a photoelectric cell. A current I is produced. The lens is replaced by another convex lens having the same diameter but focal length $20 cm$ . The photoelectric current now is :

\frac{I}{2}

4 I

2 I

Question 5.

A vessel of depth ' $d$ ' is half filled with oil of refractive index $n_{1}$ and the other half is filled with water of refractive index $n_{2}$ . The apparent depth of this vessel when viewed from above will be-

\frac{2 d (n_{1} + n_{2})}{n_{1} n_{2}}

\frac{d (n_{1} + n_{2})}{2 n_{1} n_{2}}

\frac{d n_{1} n_{2}}{2 (n_{1} + n_{2})}

\frac{d n_{1} n_{2}}{(n_{1} + n_{2})}

Question 6.

An ice cube has a bubble inside. When viewed from one side the apparent distance of the bubble is $12 cm$ . When viewed from the opposite side, the apparent distance of the bubble is observed as $4 cm$ . If the side of the ice cube is $24 cm$ , the refractive index of the ice cube is

\frac{3}{2}

\frac{4}{3}

\frac{2}{3}

\frac{6}{5}

Question 7.

When one light ray is reflected from a plane mirror with $30^{\circ}$ angle of reflection, the angle of deviation of the ray after reflection is :

140^{\circ}

130^{\circ}

120^{\circ}

110^{\circ}

Question 8.

The critical angle for a denser-rarer interface is $45^{\circ}$ . The speed of light in rarer medium is $3 \times 10^{8} m / s$ . The speed of light in the denser medium is:

2 .12 \times 10^{8} m / s

5 \times 10^{7} m / s

\sqrt{2} \times 10^{8} m / s

3.12 \times 10^{7} m / s

Question 9.

An object is placed at a distance of 12 cm in front of a plane mirror. The virtual and erect image is formed by the mirror. Now the mirror is moved by 4 cm towards the stationary object. The distance by which the position of image would be shifted, will be

4 cm towards mirror

2 cm towards mirror

8 cm away from mirror

8 cm towards mirror

Question 10.

In a reflecting telescope, a secondary mirror is used to:

make chromatic aberration zero

remove spherical aberration

reduce the problem of mechanical support

move the eyepiece outside the telescopic tube

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JEE Main Geometrical Optics Practice Questions With Solutions

JEE Main Physics Geometrical Optics Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

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