## Question

### Solution

Correct option is

6.45 cm and 5.16 cm

#### SIMILAR QUESTIONS

Q1

You are given two identical plano-convex lenses. When you place an object 20 cm to the left of a single plano-convex lens, the image appears 40 cm to the right of the lens. You then arrange the two plano-convex lenses back to back to form a double convex lens. If the object is 20 cm to the left of this new lens, what is the approximate location of the image?

Q2

Light from a denser medium 1 passes to a rarer medium 2. When the angle of incidence is θ the partially reflected and refracted rays are mutually perpendicular. The critical angle will be

Q3

A man is walking under an inclined mirror at a constant velocity V ms–1along the X-axis. If the mirror is inclined at an angle θ with the horizontal, then what is the velocity of the image?

Q4

Figure shows the graph of angle of deviation δ versus angle of incidence ifor a light ray striking a prism. The prism angle is

Q5

Light is incident on a glass block as shown in fig. If θ1 is increased slightly, what happens to θ2

Q6

A thin equiconvex lens (μ = 3/2) of focal length 10 cm is cut and separated and a material of refractive index 3 is filled between them. What is the focal length of the combination?

Q7

Behind a thin converging lens having both the surfaces of the same radius 1 cm, a plane mirror has been placed. The image of an object at a distance of 40 cm from the lens is formed at the same position. What is the refractive index of the lens?

Q8

What should be the value of distance d so that final image is formed on the object itself. (Focal lengths of the lenses are written on the lenses).

Q9

A car fitted with a convex mirror of focal length 20 cm. A second car 2 m broad and 1.6 m high is 6 m away from the first car. The position of the second car as seen in the mirror of the first car is

Q10

In the above question, if the second car is overtaking at a relative speed of 314 ms–1, how fast will the image be moving?