Physics 2002 JAMB Past Questions - Question 19: To produce an enlarged and erect image with concave mirror. the object must be positioned

Correct Answer

C

Explanation

To produce an enlarged and erect image with a concave mirror, you can place the object between the focal point (F) and the mirror's pole (P). Specifically, the object should be positioned at a distance from the mirror that is less than the focal length of the mirror. In this case, the object distance (denoted as "d_o") is negative.

When the object is placed between the focal point (F) and the mirror, a concave mirror will create an enlarged and erect virtual image. The image will be located behind the mirror, on the same side as the object, and it will appear larger than the actual object. This type of image formation is typical for concave mirrors and is often used in various optical devices, such as makeup mirrors and shaving mirrors.

Remember, the exact characteristics of the image (e.g., its size and position) can be calculated using the mirror equation and magnification formula, where "f" is the focal length of the mirror, "d_i" is the image distance, and "m" is the magnification. The formulas are as follows:

1. Mirror Equation:
  1/f = 1/d_o + 1/d_i

2. Magnification Formula:
  m = -d_i/d_o

By placing the object between the focal point and the mirror, "d_o" will be negative, and you can calculate the image distance and magnification to confirm the enlarged and erect nature of the image.