Question

(iv) The temperature of ice can be decreased below 0°C by mixing -
in it.
(a) saw dust (b) sand (c) salt (d) coal
(v) The image formed by a concave lens is always
(a) virtual and erect (b) real and erect
(c) virtual and inverted (d) real and inverted​

Answer 1

Answer:

4th answer c.salt is mixed to decrease temperature

5th answer d. real and inverted image is formed