Question

Q2. Which of the following mirror is used by a dentist to examine a small
cavity?
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Combination of convex and concave mirror
Q3. An object at a distance of 30 cm from a concave mirror gets its image
at the same point. The focal length of the mirror is
(a) - 30 cm
(b) 30 cm
(c)- 15 cm
(d) +15 cm
Q4. An object at a distance of -15 cm is slowly moved towards the pole of a
convex mirror. The image will get
(a) Shortened and real
(b) Enlarged and real
(c) Enlarge and virtual
(d) Diminished and virtual
Q5. If fe+15 and u-60 then nature of image is
(a) Real and inverted
(b) Virtual and erect
(c) Same size
(d) At infinity
Q6. The image formed by concave mirror is real, inverted and of the same
size as that of the object. The position of object should be
(a) At the focus
(b) At the centre of curvature
வயாanlaamdeantralamnre​

Answer 1

concave mirror.

-15 because same image is formed at centre of curvature and focal length is half of the centre of curvature that's why it will -15

c option

b option