Lenses
Physics ⇒ Light and Optics
Lenses starts at 8 and continues till grade 12.
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See sample questions for grade 11
A lens forms an image that is virtual, erect, and larger than the object. Which type of lens and object position is this?
A person with hypermetropia uses which type of lens in their spectacles?
A ray of light passes through the optical center of a thin lens. What happens to its path?
A student uses a convex lens to focus sunlight onto a piece of paper. What property of the lens is being demonstrated?
Describe the nature and position of the image formed by a convex lens when the object is placed at infinity.
Explain why a convex lens can be used as a magnifying glass but a concave lens cannot.
If a lens forms an image that is the same size as the object and inverted, where is the object placed?
A student uses a convex lens to focus sunlight onto a piece of paper. What property of the lens is being demonstrated?
The principal axis of a lens is:
(1) The line passing through the optical center and perpendicular to the lens surfaces
(2) The line joining the two focal points
(3) The line along the edge of the lens
(4) The line joining the centers of curvature
Which of the following combinations will result in a lens of zero power?
(1) Two convex lenses of equal focal length placed together
(2) A convex and a concave lens of equal focal length placed together
(3) Two concave lenses of equal focal length placed together
(4) A convex lens and a concave lens of different focal lengths placed together
Which of the following is a converging lens?
(1) Concave lens
(2) Convex lens
(3) Cylindrical lens
(4) Plano-concave lens
Which of the following is NOT a use of convex lenses?
(1) Magnifying glass
(2) Camera lens
(3) Spectacles for myopia
(4) Projector lens
A lens that is thicker at the edges than at the center is called a ________ lens.
Fill in the blank: The point on the principal axis of a lens where parallel rays converge (or appear to diverge from) is called the ________.
The formula for the power of a lens is P = ________.
The magnification produced by a lens is given by the ratio ________.
A concave lens always forms a virtual, erect, and diminished image. Yes or No?
True or False: A convex lens can form both real and virtual images depending on the position of the object.
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 is always real.
