for optically denser meduim P, Q and R are `30^@`, `20^@`, `15^@`. The speed of light will be minimum in.............. .Convex lens forms an erect and enlarged when object is placed between…………and ………….. .

Draw the ray diagrams and find position,nature and size of image formed by a convex lens,when object is placed: between F and 2F

What is minimum distance between an object and the real image formed by a convex lens?

Draw the ray diagrams and find position,nature and size of image formed by a convex lens,when object is placed: beyodn 2 F

Draw the ray diagrams and find position,nature and size of image formed by a convex lens,when object is placed:At F.

By giving sign-conventions, derive the lens formula relating object distance, image distance and focal length for a thin convex lens. Draw a ray diagram to show the formation of image of an object placed between optical centre and focus of a convex lens.

In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plitted using the same scale for the two axes. A straight line passing through the origin and making an angle of 45^circ with x-axis meets the experimental curve at P. The coordinates of P will be.

A screen is placed 90cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the lens.

The radii of curvature of a convex lens are 20 cm and 30 cm nd the refractive index of its material is 1.5 .How its nature nd focal length will change ,when it is immersed in a liquid of refractive index = 1.6?