An equiconvex lens of focal length `15 cm` is cut into two equal halves in thickness. What is the focal length of each half ?

An equiconvex lens of focal length20 cm is cut into two equal halves perpendicular to the principal axis and kept at a separation of 10 cm co-axially. What ils the focal length of the each part is?

The figure shows and equiconvex lens of focal length f. It the lens is cut along PQ, the focal length of each half will be

An equiconcave diverging lens of focal length F is cut into two equal halves. The two halves are turned around and joined with some liquid between them.The lens obtained is converging with focal length F. If the refractive index of the liquid is 3 then what is the refractive index of the lens?

If a equiconvex lens of focal length f is cut into two halves by a plane perpendicular to the principal axis, then

An equi-convex lens of focal length F in air is is cut into two halves along the plane perpendicular to the optic axis. One of the halves is placed between a fixed object and a screen separated by distance of 90 cm . Two images are formed on the screen for two different positions of the lens with magnification 2 and 1/2 respectively. Find the value of F . what would be the value of the focal length of the equiconvex lens if the lens is immersed in water ? Refractive index of the material of the lens is 1.5 and that of water is mu_w=4//3 .

A convex lens of focal length f cut into parts first horizontally and then vertically. Find the focal length of part A of the lens, as shown:

A thin lens of focal length + 12 cm is immersed in water (mu = 1.33). What is its new focal length ?

The rear face of an equiconvex lens of focal length 30 cm is silvered that if behave like a concave mirror The focal length of mirror is [ mu_(Lens) = 3/2]

A convex lens of focal length 15 cm is split into two halves and the two halves are placed at a separation of 120 cm. Between, the two halves of convex lens a plane mirror is placed horizontal and at a distance of 4 mm below the principal axis of the lens halves. An object of length 2 mm is placed at a distance of 20 cm from one half lens as shown in figure. Find the position and size of the final image. Trace the path of rays forming the image.