Understanding Lens Equations

What is the term used to describe the distance from the optical center to the principal focus?

• Lens distance

• Focal length

• Image distance

• Object distance

According to the lens equation, what is the relationship between U, V, and F?

• U - V = F

• U * V = F

• 1/U + 1/V = 1/F

• U + V = F

How is the focal length (F) determined for a convex lens?

• F depends on the object distance

• F is always positive

• F is zero

• F is always negative

In the context of lens equations, what is the sign of U for real objects in SPM?

• Negative

• Positive

• Zero

• Undefined

In the example with a converging lens, what is the calculated image distance (V) when U is 30 cm and F is 10 cm?

• 20 cm

• 10 cm

• 25 cm

• 15 cm

For a real image formed by a converging lens, what is the orientation of the image?

• Upright

• Inverted

• Lateral

• Virtual

In the example with a diverging lens, what is the calculated image distance (V) when U is 30 cm and F is -10 cm?

• -7.5 cm

• 7.5 cm

• -15 cm

• 15 cm

What is the nature of the image formed by a diverging lens when the image distance is negative?

• Virtual and inverted

• Real and upright

• Virtual and upright

• Real and inverted

What happens to the focal length sign when switching from a converging to a diverging lens?

• It becomes zero

• It doubles

• It becomes negative

• It remains positive

Which type of lens is associated with a positive focal length?

• Convex lens

• Planar lens

• Concave lens

• Biconcave lens