Study the data given below showing the focal length of three concave mirrors A, B and C and the respective…
Study the data given below showing the focal length of three concave mirrors A, B and C and the respective distances of objects placed in front of the mirrors :
Case | Mirror | Focal Length (cm) | Object Distance (cm)
1 | A | 20 | 45
2 | B | 15 | 30
3 | C | 30 | 20
(i) In which one of the above cases the mirror will form a diminished image of the object ? Justify your answer.
(ii) List two properties of the image formed in case 2.
(iii) (A) What is the nature and size of the image formed by mirror C ? Draw ray diagram to justify your answer.
Solution
(i) Mirror A.
as the object is placed beyond the centre of curvature of the mirror.
(ii) Same size/ Real / Inverted
(Any two)
(iii)(A) Nature-Virtual and erect
Size-magnified
[ray diagram showing concave mirror, object beyond C, image formation]
(Deduct ½ mark if direction of rays are not marked)