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 8
A lens forms an image that is the same size as the object. Where is the object placed relative to a convex lens?
A lens has a focal length of 20 cm. What is its power in diopters?
A student observes that the image formed by a lens is upside down and can be projected on a screen. What type of image is this?
A student places an object 15 cm from a convex lens of focal length 10 cm. Will the image be real or virtual?
A student observes that the image formed by a lens is upside down and can be projected on a screen. What type of image is this?
A student places an object 15 cm from a convex lens of focal length 10 cm. Will the image be real or virtual?
A student places an object 5 cm from a convex lens of focal length 10 cm. What is the nature of the image formed?
A student uses a convex lens to focus sunlight onto a piece of paper. What property of the lens is being demonstrated?
A lens forms an image that is real, inverted, and smaller than the object. Where is the object placed relative to a convex lens? (1) Between F and 2F (2) At 2F (3) Beyond 2F (4) At F
A lens forms an image that is smaller than the object. Which type of lens could it be? (1) Convex lens (2) Concave lens (3) Both (4) Neither
Which lens is used to correct short-sightedness (myopia)? (1) Convex lens (2) Concave lens (3) Cylindrical lens (4) None of these
Which of the following is a converging lens? (1) Concave lens (2) Convex lens (3) Plano-concave lens (4) None of these
A convex lens forms a virtual image when the object is placed between the lens and its ________.
The center point of a lens is called the ________.
The distance between the optical center of a lens and its principal focus is called the ________.
The formula 1/f = 1/v - 1/u is known as the ________ formula.
A real image formed by a lens can be captured on a screen. True or False?
True or False: A concave lens can form a real image if the object is placed very far from the lens.
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.
