Geometrical Optics

The distance from center of mirror, C to the pole of mirror is given as

• 2f

• v

• u

• 2R

To determine the characteristics of image formed we need to a draw ray diagram that uses

• at least 2 rays that overlap each other

• at least 3 rays out of 4 rays

• plane mirror or lens

• rays that passes through biconcave or biconvex mirror

An image that is formed at the back of the mirror is said to be

• real image

• virtual image

• inverted image

• magnified image

An image is formed upside down in front of mirror and seems bigger by 2 times from the actual size. What might be the type of mirror uses?

• concave mirror

• convex mirror

• plane mirror

• concave lens

Which statement is true about convex mirror?

• image formed is virtual and diminished

• have a positive value of focal length

• image formed is real and diminished

• image formed is real and magnified

What is the characteristic of image formed when given that u and f have the same value of length

• real or virtual, image formed at infinity

• same size, inverted and real

• magnified, inverted and real

• magnified, upright and virtual

What is the formula for magnification?

• -v / u

• -h_i / h_o

• h_i / h_o

• v/u

An object is placed 20 cm at the left side of a biconcave lens with focal length of 12 cm. Find the position of the image formed.

• -7.5 cm

• 30 cm

• -30 cm

• 7.5 cm

State the characteristic of image foremd

• real, inverted and diminished

• virtual, upright and diminished

• virtual, upright and magnified

• real, upright and diminished

Calculate the focal length when given u=15cm and a virtual image at 25 cm is formed. State the type of lens used.

• 37.5 cm (biconcave lens)

• -37.5 cm (biconcave lens)

• 37.5 cm (biconvex lens)

• 9.4 cm (biconvex lens)