A concave mirror forms an inverted image of an object placed at a distance of 12 cm from it. If the image is twice as large as the object, where is it formed ?

The human eye forms the image of an object at its ...

A real image obtained by a concave mirror is 4 times bigger than the object. If the object is displaced by 3 cm away from the mirror, the image size becomes 3 times the object size. Find the focal length of the mirror.

A convex lens of focal length 30 cm , a concave lens of focal length 120 cm , and a plane mirror are arranged as shown . For an object kept at a distance of 60 cm from the convex lens, the final image, formed by the combination , is a real image , at a distance of : |"Focal length" | = |"Focal length"| = 30 cm " " =120 cm

An object is kept at a distance of 16 cm from a thin lens and the image formed is real. If the object is kept at a distance of 6 cm from the same lens, the image formed is virtual. If the size of the image formed are equal, the focal length of the lens will be

An object is placed at a distance 40 cm in front of concave mirror. Focal length of mirror is 20 cm, so what will be type of image ?

A concave mirror forms an image I corresponding to a point object O . The equation of the circle intercepted by the xy plane on the mirror is

The redius of curvature of the convex face of a plano-convex lens is 12cm and its refractive index is 1.5. a. Find the focal length of this lens. The plane surface of the lens is now silvered. b. At what distance form the lans will parallel rays incident on the convex face converge? c. Sketch the ray diagram to locate the image, when a point object is places on the axis 20cm from the lens. d. Calculate the image distance when the object is placed as in (c).

Consider a concave mirror and a convex lens (refractive index 1.5) of focal length 10 cm each separated by a distance of 50 cm in air (refractive index = 1) as shown in the Fig. An object is placed at a distance of 15 cm from the mirror. Its erect image formed by this combination has magnification M_1 . When this set up is kept in a medium of refractive index 7//6 , the magnification becomes M_2 . The magnitude ((M_2)/(M_1)) is : .

In the human eye, the image of an object is formed at the ........