A boy of height 1m 45 cm is standing in front of long mirror at a distance 2 m . From this information, fill up the following sentences:c) When the boy moves 1 m forward, the distance between her and her image is-----

A boy of height 1m 45 cm is standing in front of long mirror at a distance 2 m . From this information, fill up the following sentences:b)The height of the image is-----

A boy of height 1m 45 cm is standing in front of long mirror at a distance 2 m . From this information, fill up the following sentences:a)The distance between the boy and his image is----

An object place in front of a plane mirror is displaced by 0.4 m along a straight line at angle of 30^@ to mirror plane, the change in the distance between the object and its image is

An object of length 2.5 cm is placed at the principal axis of a concave mirror at a distance 1.5 f. The image height is

A source emitting sound of frequency 180 Hz is placed in front of a wall at a distance of 2 m from it. A detector is also placed in front of the wall at the same distance from it. Find the minimum distance between the source and the detector for which the detector detects a maximum of sound. Speed of sound in air =360ms^-1 .

A boy stands straight in front of a mirror at a distance of 30 cm away from it. He sees his erect image whose height is (1/5)^(th) of his real height . The mirror he is using is

A plane mirror forms a virtual image.The distance between Maria and her image in a plane mirror is 10 m. How much distance should she move in order to get the distance of 5 m between herself and her image?

Two boys are sitting is very close to each other at a distance of 0.5 m from each other. If the mass of one boy is 40 kg and other is 50 kg, find the gravitational force between them.

A concave mirror forms an image of 20 cm high object on a screen placed 5.0 m away from the mirror. The height of the image is 50 cm. Find the focal length of the mirror and the distance between the mirror and the object.

A boy is at a distance of 60 m from a tree, makes an angle of elevation of 60^@ with the top of the tree. What is the height of the tree?