Questions asked
Vivek K
Numerade educator
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 10cm. What is the focal length and power of the combination?
A cyclist covers the distance of 6 km in 15 minutes. Find his speed?
A convex lens of focal length 10cm is placed at a distance of 12cm from a wall. How far from the lens should an object be placed so as to form its real image on the wall?
"A convergent lens of power 8D is combined with a divergent lens of power -10 D. Calculate focal length of the combination. "
A concave lens of focal length 25 cm and a convex lens of focal length 20 cm are placed in contact with each other. What is the power of this combination? Also, calculate focal length of this combination.
A concave lens of 20 cm focal length forms an image 15cm from the lens. Compute the object distance.
A concave lens has a focal length of 15 cm. At what distance should an object from the lens be placed so that it forms an image at 10 cm from the lens? Also find the magnification of the lens.
A car weighing 1000 kg moving with a velocity of 40 m/s retards uniformly coming to rest in 10 s. Calculate the initial momentum of the car.
A car is being driven by a force of 2.5 × 10^10N. Travelling at a constant speed of 5 m/s, it takes 2 minutes to reach a certain place. Calculate the work done.
A bus of mass 500 kg is moving with a velocity of 5 m/s and is acted upon by a forward force of 500 N due to engine and retarding force of 200 N due to friction. Velocity of bus after 20 s will be