Refraction and reflection

A 10 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 18 cm. What is size of the image formed.

• 15cm

• 12cm

• 36cm

• 20cm

An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm. What is the position of the image formed

• -60cm

• -10cm

• -20cm

• +10cm

A student uses a lens of focal length -20 cm. What is the power of the lens

• +0.5D

• -0.5D

• +5D

• -5D

An object is placed at a distance of 30 cm in front of a convex mirror of focal length 15 cm. Which of the following Characteristics of the image are correct

• Virtual, inverted and diminished

• Virtual, Erect and diminished

• Real, erect and enlarged

• Real, direct and diminished

An object is placed at a distance of 15 cm from a convex lens of focal length 20 cm. The four characteristics of the image formed are

• Real, inverted, enlarged and behind the lens

• Real, inverted, enlarged and on the same side as the object

• Virtual, erect, diminished and on the same side as the object

• Virtual, erect, enlarged and on the same side as the object

An object is placed at a distance of 15 cm from a man cave lens of focal length 30 cm. The four characteristics of the image formed are

• Virtual, erect, diminished and laterally inverted

• Virtual, inverted, enlarged and laterally inverted

• Real, inverted, enlarged and laterally inverted

• Real, inverted, diminished and laterally inverted

3 cm tall object is placed 18 cm in front of a concave mirror of focal length 12 cm. At what distance from the mirror should a screen be placed to see a sharp image of the object on the screen.

• +36cm

• +24cm

• -36cm

• -24cm

If a concave mirror forms a real image 40 cm from the mirror, when the object is placed at a distance of 20 cm from its own, then the focal length of the mirror is

• -40cm

• +40cm

• -40/3 cm

• -20/3 cm

The refractive index of the glass is 1.5 and the refractive index of water is 1.33 then The refractive index of the glass with respect to the water is

• 1.5

• 0.66

• 0.88

• 1.125

an object is placed between F and 2F in front of a concave lens then the image is formed

• Beyond 2F In front of the lens

• Between F & 2F In front of the lens

• Between O & F In front of the lens

• Between O & F behind the lens