Image Formation by the Lens

The focal length of a convex lens is 20 cm. Where should an object be placed to form a real and magnified image?

• Beyond 40 cm

• At 20 cm

• Between 20 cm and 40 cm

• At 40 cm

A concave lens always forms:

• Virtual and magnified images

• Real and magnified images

• Real and inverted images

• Virtual and diminished images

A virtual image is always:

• Larger than the object

• Smaller than the object

• Erect

• Inverted

If the object is placed at the focal point of a convex lens, the image formed is:

• At infinity

• Real and inverted

• Virtual and upright

• Highly magnified and real

A ray of light passing through the optical center of a lens:

• Retraces its path

• Emerges parallel to the principal axis

• Passes through the focus

• Passes undeviated