Calculate Focal Length Problems Mirror Equation

An object is placed 10 cm from a convex mirror. Its image is formed 5 cm behind the mirror.The focal length of the given convex mirror is

• -5 cm
• 5 cm
• 10 cm
• -10cm

A real image having a size of 10 cm is formed by a concave mirror. The size of the object is 5 cm.The magnification of the object is

• -5
• 5
• 2
• -2

An object is placed 20 cm from a concave mirror with a focal point of 15 cm. Where will the image be located.

• 15 cm

• 20 cm`

• 60 cm

• -8.6 cm

An object is placed 20 cm from a convex mirror with a focal point of 15 cm. Where will the image be located.

• -15 cm

• -20 cm`

• 60 cm

• -8.6 cm

An object is located 5 cm from a concave mirror with a focal point of 15 cm. What is the location of the image?

• -7.5 cm

• -3.75 cm

• 7.5 cm

• there is no image

An object is located 5 cm from a convex mirror with a focal point of 15 cm. What is the location of the image?

• -7.5 cm

• -3.75 cm

• 7.5 cm

• there is no image

An image is formed upside down in front of mirror and seems bigger by 2 times from the actual size. What might be the type of mirror uses?

• concave mirror

• convex mirror

• plane mirror

• concave lens