Question

A candle is placed in front of an optical instrument, and an image is obtained as inverted, real, and on the same side of the device. Identify the device that would produce the types of images described above.
A. Concave Mirror
B. Convex Mirror
C. Concave Lens
D. Convex Lens
E. Flat Mirror

Answer 1

Hint: Recall the Characteristics of the Concave and Convex Mirror and lens and thus choose the correct answer accordingly, matching the characteristics given in the question. This is also used in many household devices and equipment like flashlight, headlight, and other devices such as aircraft and telescopes. You can also use this to focus sunlight to produce heat from solar furnaces.

Complete step by step answer:
A concave mirror is a converging mirror. It converges the light ray incident on it at a single point. As the light rays actually meet after reflection, the images formed are real and they are inverted and of course on the same side as that of the object.
If a hollow sphere is cut into parts and the outer surface of the cut part is painted, then it becomes a mirror with its inner surface as the reflecting surface. This kind of mirror is known as a concave mirror. Light converges at a point when it strikes and reflects back from the reflecting surface of the concave mirror. Hence, it is also known as a converging mirror.

These are the following properties of Concave Mirror:
1. If the object is put in between the focus and mirror - In that case, the image form on the surface is virtual and bigger than the object and of the same orientation as the object.
2. If the object is put in between the centre of the mirror and focus point - In this case, the image formation by the mirror is real and bigger than the object. In addition, the image formation is also inverted.
3. The object is kept two focal distances away from the mirror - In that case, the image will be real and inverted. Besides, the image formation is smaller in size.

So, the correct answer is “Option A”.

Note:
- When you will place the concave mirror very close to the object, you can get a virtual and magnified image.
- But there is also a possibility to get a real image with reducing size if you increase the distance between the concave mirror and the object.
- Light converges at a point when it strikes and reflects back from the reflecting surface of the concave mirror.