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प्रश्न
State whether convex lens has a real focus or a virtual focus.
उत्तर
A convex lens has a real focus because all the light rays actually pass through the focus.
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संबंधित प्रश्न
An object AB is placed between O and F1 on the principal axis of a converging lens as shown in the diagram.
Copy the diagram and by using three standard rays starting from point A, obtain an image of the object AB.
A ray of light travelling in water emerges into air. Draw a ray-diagram indicating the change in its path.
What is the position of image when an object is placed at a distance of 10 cm from a convex lens of focal length 10 cm?
An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens.
What kind of lens can form:
an erect magnified image?
A parallel oblique beam of light falls on a convex lens. Draw a diagram to show the refraction of light through the lens.
A student focussed the image of a distant object using a device ‘X’ on a white screen ‘S’ as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device.
(A) The device X is a convex lens of focal length 20 cm.
(B) The device X is a concave mirror of focal length 40 cm.
(C) The device X is a convex mirror of radius of curvature 40 cm.
(D) The device X is a convex lens of focal length 40 cm.
Can a normal convex lens behave like a concave lens and vice-versa?
Convex lens is also known as ______.
Distinguish between Concave lens and Convex Lens.
