Lenses
Physics ⇒ Light and Optics
Lenses starts at 8 and continues till grade 12.
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See sample questions for grade 10
A lens forms an image that is real, inverted, and the same size as the object. Where is the object placed?
A lens forms an image that is virtual, erect, and smaller than the object. What type of lens is it?
A lens has a power of -2 D. What type of lens is it?
A lens is used as a magnifying glass. What type of lens is it?
A student uses a lens to project an image of a distant tree onto a screen. The image is real and inverted. What type of lens is being used?
Describe what happens to the image formed by a convex lens as the object moves from infinity towards the lens.
A student places an object 10 cm from a convex lens of focal length 15 cm. Where will the image be formed?
A student uses a lens to project an image of a distant tree onto a screen. The image is real and inverted. What type of lens is being used?
Which of the following is a converging lens?
(1) Concave lens
(2) Convex lens
(3) Plano-concave lens
(4) Biconcave lens
Which of the following is NOT a characteristic of the image formed by a concave lens?
(1) Virtual
(2) Erect
(3) Magnified
(4) Diminished
Which of the following is NOT a type of lens?
(1) Biconvex
(2) Plano-concave
(3) Biconcave
(4) Parabolic
Which of the following is NOT a use of lenses?
(1) Spectacles
(2) Cameras
(3) Mirrors
(4) Microscopes
A lens that is thicker at the center than at the edges is called a ________ lens.
A ray of light passing through the optical center of a lens will emerge ________.
A real, inverted, and magnified image is formed by a convex lens when the object is placed ________ the focus and 2F.
The distance between the optical center and the principal focus of a lens is called the ________.
True or False: A concave lens always forms a virtual, erect, and diminished image.
True or False: A convex lens can form a virtual image only when the object is placed between the lens and its focus.
True or False: The image formed by a concave lens is always on the same side of the lens 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.
