Lenses

An object of height $3 \mathrm{cm}$ is placed at $10 \mathrm{cm}$ from a concave lens of focal length $15 \mathrm{cm}$. Select the correct size of the image.

The convex lens always gives small virtual image.

What are thick and thin lenses?

What is a Biconvex lens? Draw the outline of the Biconvex lens.

Assertion: Virtual images are always erect.

Reason: Virtual images are formed by diverging lenses only.

What is centre of curvature of a lens?

A _____ (convex / concave) lens can produce both real and virtual images.

Which lens diverges the light rays falling on it?

Which lens is used as a magnifying glass - convex lens or concave lens?

At what distance from a convex lens of focal length $24 \mathrm{cm}$, should an object be placed so that the lens forms an image of the same size as the object?

To obtain a magnification of, $-\frac{1}{2}$ with a convex lens, the object should be placed:

Out of the five incident rays shown in the figure find the two rays that are obeying the laws of refraction and may be used for locating the position of image formed by a convex lens__

When the object is placed between the $f$ and $2f$ of a convex lens, it produces a virtual, erect and magnified image.

Select the correct ray diagram for image formation by concave lens when the object is placed between infinity and optical centre.

Identify from the following the correct statement about the characteristics of the image formed by a convex lens having a focal length of $25 \mathrm{cm}$ when the object is kept on the principal axis at a distance of $50 \mathrm{cm}$ and $75 \mathrm{cm}$.

A bi-convex lens converges the parallel rays on the principal axis at $10 \mathrm{cm}$, then focal length is

Select the correct ray diagram for the image formation in a convex lens when an object is placed beyond $2F_1$.

Select the correct ray diagram for the image formation in a convex lens when an object is placed at focus $F_1$.

When light rays which are parallel to principal axis incident convex lens, after refraction, the light rays will coincide at ____.

The virtual images formed by a concave lens are diminished whereas the virtual images formed by a convex lens are enlarged.