The Mirror Equation; Ray Optics & Optical Instruments
Q1.
The answer is (B) Virtual and inverted.
The mirror formula is:
1/f = 1/u + 1/v
where,
- f is the focal length of the mirror
- u is the object distance
- v is the image distance
The radius of curvature of a spherical mirror is twice its focal length, so f = 20 / 2 = 10 cm.
The object distance is 15 cm, so u = -15 cm.
The image distance is v = ?
Substituting these values into the mirror formula, we get:
1/10 = 1/(-15) + 1/v
1/10 + 1/15 = 1/v
3/30 = 1/v
v = 30 cm
Since the image distance is positive, the image is real. Since the image is on the opposite side of the mirror from the object, the image is inverted.
**
BETA
