Practice Refraction By Spherical Lenses (9.3.3) - Light

Practise this section

9 questions

Flashcard drill
2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
What is the sign of the focal length for a convex lens?
Show hintHide hint
Remember the behavior of light with convex lenses.
Question 2.
What does it mean if an object is located at -15 cm from the optical center?
Show hintHide hint
Think about the direction of measurements.
3Question 3.
What is the focal length of a convex lens?
- Positive
- Negative
- Zero
Show hintHide hint
Think about how the lens focuses light.
4Question 4.
A concave lens has a focal length of -15 cm. Is this lens diverging or converging?
- Diverging
- Converging
Show hintHide hint
Recall the characteristics of concave lenses.
Question 5.
A concave lens produces a virtual image at 4 cm from the lens when the object is placed at 6 cm. Calculate the focal length.
Show hintHide hint
Don’t forget the signs when substituting values!
Question 6.
Given a convex lens with a focal length of +20 cm, determine the image distance for an object placed at +30 cm.
Show hintHide hint
Pay attention to where each measurement is taken from.

5 more questions in this section. Enroll free to practise them all.