Practice Paper: Light (Grade-10)

Which of the following correctly represents the mirror formula?

• 1/f = 1/v - 1/u

• 1/f = 1/u - 1/v

• 1/f = 1/v + 1/u

• 1/f = 1/v × 1/u

What is the correct sign convention for the focal length of a concave mirror?

• Positive

• Negative

• Zero

• Depends on the object’s position

If an image formed by a concave mirror is real and inverted, what is the magnification of the image?

• Positive

• Negative

• Zero

• Equal to infinity

The magnification produced by a convex mirror is always:

• Positive and less than 1

• Negative and less than 1

• Positive and greater than 1

• Negative and greater than 1

For a real and inverted image formed by a concave mirror, the magnification is given by:

• m = -v/u

• m = v/u

• m = u/v

• m = (v+u)/u

What is the correct sign convention for the object distance in front of a concave mirror?

• Positive

• Negative

• Zero

• Positive or negative depending on the object position

If the image distance (v) is -20 cm and the object distance (u) is -10 cm for a concave mirror, what is the focal length (f)?

• -30 cm

• -15 cm

• 20 cm

• 30 cm

In a convex mirror, if the object is at infinity, where is the image formed?

• At the focus

• At the center of curvature

• Between the pole and focus

• At infinity

The magnification produced by a concave mirror when the object is placed beyond the center of curvature is:

• Greater than 1

• Less than 1

• Equal to 1

• Depends on the object’s position

Which of the following statements is true for the sign convention in mirrors?

• All distances are measured from the pole of the mirror.

• Distances measured in the direction of the incident light are positive.

• Distances measured opposite to the direction of incident light are negative.

• All of the above