Image Formation by Lenses
Physics ⇒ Light and Optics
Image Formation by Lenses starts at 8 and continues till grade 12.
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See sample questions for grade 11
A lens has a focal length of -20 cm. What type of lens is it?
A student uses a convex lens to project an image of a candle on a screen. The image is inverted and smaller than the candle. Where is the candle placed relative to the lens?
Describe the image formed by a convex lens when the object is placed at a distance less than the focal length.
Describe the nature, position, and size of the image formed by a convex lens when the object is placed between F and the optical center.
Explain why a concave lens cannot form a real image of a real object.
If the magnification produced by a lens is +2, what does the positive sign indicate?
State the sign convention for the focal length of a concave lens.
A student uses a convex lens to project an image of a candle on a screen. The image is inverted and smaller than the candle. Where is the candle placed relative to the lens?
A lens forms an image that is real, inverted, and the same size as the object. Where is the object placed? (1) At F (2) At 2F (3) At infinity (4) Between F and 2F
A lens forms an image that is smaller than the object. Which of the following could be true? (1) The lens is convex and the object is beyond 2F. (2) The lens is concave. (3) Both (1) and (2) (4) Neither (1) nor (2)
If an object is placed at infinity in front of a convex lens, where is the image formed? (1) At F (2) At 2F (3) At infinity (4) At the optical center
If the object is placed at 2F in front of a convex lens, where will the image be formed? (1) At F (2) At 2F on the other side (3) At infinity (4) Between F and 2F on the other side
A concave lens always forms a _______ and _______ image.
The distance between the optical center and the principal focus of a lens is called the _______.
The formula 1/f = 1/v - 1/u is known as the _______ formula for lenses.
The magnification produced by a lens is given by the ratio _______ / _______.
True or False: A convex lens can form both real and virtual images.
True or False: The focal length of a convex lens is always positive according to the Cartesian sign convention.
True or False: The image formed by a concave lens is always on the same side as the object.
True or False: The image formed by a convex lens can be smaller, equal, or larger than the object depending on the object's position.
