An object is placed 60 cm from a convex lens of focal length 10 cm. At what distance from the lens is the image formed?
Answer and explanation
Correct answer: D. 12 cm
- Step 1: With and : , so cm. Answer: 12 cm. Why not the others: 60/7 cm: uses a plus sign in the denominator. 30 cm: assumes the image is halfway. 70 cm: adds the object distance and focal length.
Practise more Physics calculations.
Free questions with an explanation for every one, and full timed Medical Entrance Exam (University of Iceland) mock tests.
More Physics calculations questions
- A ball is thrown at 50 m/s at 45° to the ground. Taking m/s², what is its horizontal range?
- A simple pendulum has length 6.4 m. Taking m/s², what is its time period?
- Two point charges of 4 μC and 3 μC are placed 0.9 m apart in air. Taking N m²/C², what is the force between them?
- Capacitors of 4 μF and 6 μF are joined in series. What is the equivalent capacitance?
- How much energy is stored in a 10 μF capacitor charged to 10 V?
- Photons of energy 4 eV fall on a metal of work function 2.5 eV. What is the maximum kinetic energy of the emitted photoelectrons?