# Magnification

## Trending Questions

**Q.**

An object is placed 15cm from a convex mirror of radius of curvature 90cm. Calculate image position and magnification.

**Q.**

An object of size 7.5cm is placed in front of a convex mirror of radius of curvature 25cm at a distance of 40cm The size of the image should be

- 2.3cm
- 1.78cm
- 1cm
- 0.8cm

**Q.**A point object is placed at a distance of 30 cm from the pole of a concave mirror on the principal axis. The velocity of the image with respect to ground will be,

[ The velocity of the object is given with respect to ground]

- 2 cm/s downwards
- 2 cm/s upwards
- 4 cm/s upwards
- 4 cm/s downwards

**Q.**a rod AB of length 5cm lies along the principal axis of the concave mirror of focal length 15cm in such a way that theend closer to the pole is 30 cm away from it. Find the length of image

**Q.**Car B overtakes another car A at a relative speed of 40 ms−1. How fast will the image of car B appear to move, in the mirror of focal length 10 cm, fitted in car A, when the car B is 1.9 m away from the car A?

- 4 ms−1
- 0.1 ms−1
- 40 ms−1
- 0.2 ms−1

**Q.**The velocity of the image with respect to ground in the figure shown below figure will be :

[Mirror is at rest and velocity of the object (O) is given with respect to ground]

- 45 m/s towards the mirror
- 35 m/s towards the mirror
- 45 m/s away from the mirror
- 35 m/s away from the mirror

**Q.**Determine the velocity of image with respect to mirror:

(0.25^i−0.5^j) m/s

(0^i−0.5^j) m/s

(0.5^i−1^j) m/s

(0.1^i−0.5^j) m/s

**Q.**6.A thin rod of length f/3 is placed along the principal axis of a concave mirror of focal length f such that its real elongated image just touches the rod. The magnification produced by the mirror is

**Q.**

The radius of curvature of a concave mirror is 24 cm and the image is magnified by 1.5 times. The object distance is???

**Q.**Find the velocity of image of point object P (in cm/s) formed by the plane mirror :

- 2^i+10^j
- 2^i−10^j
- 10^i+2^j
- 10^i−2^j

**Q.**For the situation shown in the figure, find the velocity of the image formed by the mirror.

- 5(1+√3)^i+5√3^j m/s
- 5(1+√3)^i−5√3^j m/s
- −5(1+√3)^i+5√3^j m/s
- −5(1+√3)^i−5√3^j m/s

**Q.**The origin of x and y coordinates is the pole of a concave mirror of focal length 20 cm. The x-axis is the optical axis with x>0 being the rear side of mirror. A point object at the point (30 cm, 1 cm) is moving with a velocity 10 cm/s in positive x-direction. The velocity of the image in cm/s is approximately

- −80^i+8^j
- −40^i−2^j
- −40^i+2^j
- 40^i−4^j

**Q.**An infinitely long rod lies along the axis of a concave mirror of focal length f, the near end of rod is at a distance u>f from mirror. What is length of image?

**Q.**uv graph for convex mirror is shown in figure. If the magnification of a real object placed at 25 cm from mirror is (4x), then x is:

**Q.**A concave lens has focal length of 10 cm. If the object is placed at a distance of 30 cm from the lens, then the magnification produced by the lens is

- 1.33
- 0.25
- 0.84
- 1.25

**Q.**The focal length of the mirror shown in figure is 20 cm. A point object at O is moving with velocity 5 mm/s making an angle of 37∘ with the principal axis as shown. Then, which of the following graphs correctly represents the position and direction of velocity of its image at this instant?

**Q.**The velocity of the image with respect to ground in the below shown figure will be

[Mirror is at rest and velocity of the object (O) perpendicular to the principal axis is given with respect to ground]

- 10 m/s moving downwards
- 10 m/s moving upwards
- 20 m/s moving downwards
- 20 m/s moving upwards

**Q.**

A thin stick of length f5 is placed along the principal axis of a concave mirror of focal length f such that its image which is real and elongated just touches the stick. what is the magnification?

**Q.**An object and a plane mirror are moving as shown in figure. Determine the velocity of image with respect to ground.

- 4^i+3^j m/s
- −4^i m/s
- −4^i+3^j m/s
- 4^i m/s

**Q.**(4)30cmm2).A source of light is at 10 cm from a convex mirror and is then moved to a distance of 2 cm fromthe mirror. How much does the image move, if the radius of curvature of the mirror is 4.8 cm?

**Q.**Find the position of the image formed after the first reflection from the concave mirror as shown in the figure.

- at 20 cm from mirror on the left side
- at 40 cm from mirror on the left side
- at infinity
- at 10 cm from mirror on the left side

**Q.**An object O is moving with velocity (^i+2^j+3^k) m/s and a plane mirror facing the object is lying in (y−z) plane. If the mirror is moving with velocity 2^i m/s, the velocity of image w.r.t object (in SI units) is :

- −^i+2^j+3^k
- 2^i
- 3^i+2^j+^k
- −^i−2^j−3^k

**Q.**In the figure shown, two plane mirrors M1 and M2 are fixed on the two blocks A and B as shown in the figure. An object is placed midway between the two mirrors . Find the acceleration of the image formed by mirror-2 w.r.t the image formed by mirror-1.

- 22g15
- −22g15
- −44g15
- 44g15

**Q.**A square plate of side l is placed on the principal axis at focal point F of a convex mirror such that the principal axis is passes through the centre of plate normally .the area of image of the plate is

**Q.**The sun (diameter d) subtends an angle θ radians at the pole of a concave mirror of focal length f. What is the diameter of the image of the sun formed by the mirror ?

- θf
- 2θf
- Zero
- ∞

**Q.**Find the velocity of image w.r.t ground. The mirror is at rest and the object is moving perpendicular to the axis with 5 m/s as in figure.The magnitude of velocity of image(in m/s) is

**Q.**Find the number of imges formed according to the given cases

- 8 , 9
- 9 , 8
- 8 , 8
- 9 , 9

**Q.**An extended object of size 2 mm is placed on the principal axis of a converging lens of focal length 10 cm . It is found that when the object is placed perpendicular to the principal axis the image formed is 4 mm in size. The size of image when it is placed along the principal axis is

**Q.**A plane mirror is placed at the origin parallel to y− axis, facing the positive x− axis. An object starts from (2 m, 0, 0) with a velocity of (2^i+2^j) m/s. The relative velocity of image with respect to object is along

- positive x− axis
- negative x− axis
- positive y− axis
- negative y− axis

**Q.**Find the velocity of the image of object O with respect to ground in the given figure. The velocities of the object and the mirror w.r.t ground are given.

- 54 cm/s towards the mirror
- 74 cm/s towards the mirror
- 74 cm/s away from the mirror
- 79 cm/s away from the mirror