A beam of light passing through a diverging of focal length 0.3m appear to be focused at a distance 0.2m behind the lens . Find the position the object .

A concave lens of focal length 20 cm is placed at a distance of 35 cm from an object. Find the position of the image and its magnification.

A double convex lens made of glass of refractive index 1.5 has both radii of curvature 20 cm each. Find the focal length of the lens. If an object is placed at a distance of 15 cm from this lens, find the position of the image formed.

An object is placed on the principal axis of concave mirror of focal length 10 cm at a distance of 8.0 cm from the pole. Find the position and the nature of the image.

Passing through (0, 0) with slope m.

A convex lens of diameter 8.0 cm is used to focus a parallel beam of light of wavelength 620 nm. If the light be focused at a distance of 20 cm from the lens, what would be the radius of the central bright spot formed ?

A 5 cm tall object is placed fraction to the principle axis of a convex lens of focal length 20 cm . The distance of the object from the lens is 30 cm. Find the (i) position, (ii) Nature, (iii) Size of the image formed. Given Object size , h_(0) =5 cm Object size , h_1 = 5cm Object distance , u=-30 cm Focal length of convex lens , f= 20 cm To find : size of image h_1 = ? Nature of image = ? Position of image = ?

A beam of light of wavelength 590 nm is focused by a converging lens of diameter 10.0 cm at a distance of 20 cm from it. find the diameter of the disc image formed.

An object is placed at a distance of 30 cm from a concave lens of focal length 15cm. An erect and virtual image is formed at a distance of 10 cm from the lens. Calculate the magnification.

A pin of length 2.00 cm is placed perpendicular to the principal axis of a converging lens. An inverted image of size 1.00 cm is formed at a distance of 40.0 cm from the pin. Find the focal length of the lens and its distance from the pin.