Calculate focal length of a spherical mirror from the following abservations. Object distance `u=(20.1pm0.2)cm` and image distance `v=(20.1pm0.2)cm`

The focal-length of a spherical mirror of radius of curvature 20cm is

In case of a spherical mirror show how magnification (m) depends on focal length (f) of the mirror and image distance (v).

The focal length of a concave mirror is 20 cm . Where should an object be placed to get an image magnified twice?

A concave mirror of focal length 36 cm and a convex mirror of focal length 20 cm are placed face to face on the same axis at a distance of separation 80 cm. An object is placed at a distance 20 cm in front of the convex mirror. Determine the position of the images (i) first by the reflection in convex mirror and then in the concave mirror and (ii) first by the reflection in concave mirror and then in the convex mirror.

If 'f' is the focal length of a lens then prove uv=f^2 . U and V represent object and image distances from focus respectively.

A short linear object of length L lies on the axis of a spherical mirror of focal length f at a distance K from the mirror. Calculate the axial length of the image.

A compound microscope has an objective lens of focal length 1 cm and an eyepiece of focal length 2.5 cm . (i) If a distinct image of an object situated at a distance of 10.5 cm from the objective is seen , the magnification will be

The focal lengths of the objective and the eyepiece of a compound microscope are 1 cm 5 cm respectively. If an object is placed at a distance of 1.1cm from the objective the final image is formed at a distance of 25 cm from the eyes. Determine the magnification and the distance between the lenses.

An object is placed at a distance of 25cm from a concave mirror and a real image is formed by the mirror at a distance of 37.5cm What is the length of the mirror? Now if the object is moved 15cm towards the mirror, what will be the image distance, its nature and magnification ?

A small object is situated at a distance of 10 cm in front of a plane mirror. If you stand behind the object at a distance of 30 cm from the mirror and look at the image, then to you the distance of the image will be