An object, along with the light source, is 5 cm to the left of an unknown optica

Question

An object, along with the light source, is 5 cm to the left of an unknown optical element as shown below. The optical element generates an image 15cm to the right of the optical element.

Part A

What is the object distance o if the optical element is a lens?

Enter the number with the appropriate sign (cm)

Part B

What is the object distance i if the optical element is a lens?

Enter the number with the appropriate sign (cm)

Part C

What is the object distance o if the optical element is a mirror?

Enter the number with the appropriate sign (cm)

Part D

What is the object distance i if the optical element is a mirror?

Enter the number with the appropriate sign (cm)

Explanation / Answer

sign convention is +ve if distance is measured along the direction of light from the center of the lens/mirror.

PART A:

Object distnace in this case is O= -5 cm

PART B:

Image distance is I= 15 cm

PART C:

Object distnace in this case is O= -5 cm

PART D:

Image distance is I= 15 cm

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