Formation of Image by Concave Mirror

How far should an object be from the pole of a concave mirror of focal length $20 \mathrm{cm}$ to form a real image whose size is $\frac{1}{5}th$ of the size of the object.

An object of $4 \mathrm{cm}$ high placed in front of concave mirror of focal length $20 \mathrm{cm}$ forms $8 \mathrm{cm}$ high image. Find the position of object and position of image.

A concave mirror forms real image of height $4 \mathrm{cm}$ of an object $1 \mathrm{cm}$ high placed at $20 \mathrm{cm}$ apart from the mirror. Calculate the image distance and focal length of the mirror.

An object $3 \mathrm{cm}$ high is placed at a distance of $10 \mathrm{cm}$ in front of a concave mirror of focal length $20 \mathrm{cm}$. Find the position, nature and size of the image formed.

In an experiment the image of a distant object formed by a concave mirror is obtained on a screen to determine the focal length of the mirror, you need to measure the distance between the:

Four students $A\mathit{,}\mathit{ }B\mathit{,}\mathit{ }C\mathit{ }$and $D$ carried out measurements of focal length of a concave mirror as shown in the four diagrams.

the best result will be obtained by students:-

Focal length of a concave mirror is ______

Explain the different types of images formed by a concave mirror. Also give the characteristics of the image in each case.

Give the various rules for obtaining images formed by a concave mirror.

What is the minimum number of rays required for locating the image formed by a concave mirror for an object. Draw a ray diagram to show the formation of a virtual image by a concave mirror.

A student obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen, he will have to shift the mirror:

If the image formed by a concave mirror is virtual, erect and magnified, then the object is placed

While doing experiments with candle to find focal length of a concave mirror, the candle is placed

Condition When concave mirror can form an image larger than the actual object is__

If a concave mirror is dipped in water then its focal length will__

If we focus the concave mirror to reflect sunlight towards a point at a distance $‘\mathrm{x}’$, skin burn is sensed. The distance $\mathrm{x}$ is equal to _____.

If any object is placed beyond centre of curvature of a concave mirror, the position of image will be:

If any object is placed at the centre of curvature of a concave mirror, then its image is formed at _____.

A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focussing a well illuminated distant object. What should the student do?

A student focussed the image of a distant object using a device X on a white screen X as shown in the figure. If the distance of the screen from the device is $30 \mathrm{cm}$, select the correct statement about the device X.