An object 2 cm high is placed at a distance of 64 cm from a white screen. On placing a convex lens at a distance of 32 cm from the object it is found that a distinct image of the object is formed on the screen.

**1. What is the focal length of the convex lens?**

a. 14 cm

b. 15 cm

c. 16 cm

d. 17 cm

**2. What is the size of the image formed on the screen?**

a. Less than the size of object

b. Greater than size of object

c. Same size as object

d. None of these

**3. What is the height of the image?**

a. 1 cm

b. 2 cm

c. 3 cm

d. 4 cm

**4. Power of convex lens is**

a. Positive

b. Negative

**5. A full length image of a distant tall building can definitely be seen by using**

a. A concave lens

b. A convex lens

c. A plane lens

d. Both concave as well as plane lens