A fluorescent lamp of length `1m` is placed horizontally at a depth of `1.2 m` below a ceiling . `A` plane mirror of length `0.6 m` is placed below the lamp parallel to and symmetric to the lamp at a distance `2.4 m` from it as shown in figure. Find the length in meters (distance between the extreme points of the visible region along `x`-axis ) of the reflected patch of light on the ceiling.

A boy 1.5m tall standing from a lamp at a distance of 3m. The lamp casts a shadow of 4.5m. Find the height of the lamp.

A converging lens is to projected image of a lamp 4 times the size of the lamp on a wall at a distance of 10m from the lamp. The focal length of the lens is

A 1.5m tall boy stands at a distance of 3m from a lamp post and casts a shadow of 4.5m on the ground. Find the height of the lamp.

Two plane mirrors M1 and M2 are inclined at 30° to the vertical. A point object (O) is placed symmetrically between them at a distance of 4 cm from each mirror. Find the distance of the object from the second image formed in mirror M1.

A plane mirror 50 cm long, is hung on a vetical wall of a room, with its lower edge 50 cm above the ground. A man stands of the mirror at a distance 2 m away from the mirror. If his eyes are at a height 1.8 m above the ground, then the length (distance between the extreme points of the visible region perpendicular to the mirror ) of the floor visible to him due to refliection from the mirror is (x)/(26)m . Find the value of x

How far from a lamp must a concave mirror of focal length 3 m be placed in order to throw an image on a screen 8 m from the lamp?

If a 1.5 m-tall girl stands at a distance of 3 m from a lamp-post and casts a shadow of length 4.5 m on the ground, then the height of the lamp-post is

Two plane mirrors M_(1) and M_(2) are placed parallel to each other 20 cm apart. A luminous point object 'O' is placed between them at 5 cm from M_(1) as shown in figure :

A point object is placed at a distance of 0.3 m from a convex lens (focal length 0.2 m) cut into two halves each of which is displaced by 0.0005 m as shown in the figure. Find the position of the image . If more than one image is formed find their number and the distance between them.