1) A concave mirror of focal length 8 cm forms an inverted image of an object placed at a certain distance. If the image is twice as large of object, where is the image formed a) 24 cm b) 12 cm c) -24 cm d) 8 cm 2) Calculate the power of the eye lens of the normal eye, when it is formed at far point and near point, given the diameter of the eye is 2.5 cm. Find the maximum variation in the power of the normal eye lens. a) -4D b) 40 D c) 88D d) 4D 3) What is the lens formula a) 1/v = 1/f+ 1/u b) 1/v = 1/f c) 1/u + 1/f = 1/f2 d) 1/u + 1/v = 1/f 4) Choose the correct statement a) The final image formed by a terrestrial telescope is inverted. b) The final image formed by an astronomical telescope is erect c) The final image of an astronomical telescope is magnified d) both a and b 5) Light appears to travel in a straight line because a) it passes by the atmosphere b) none c) its velocity is large d) it is a form of energy 6) When a light ray passes from an optically denser medium into an optically rarer medium, a) it's velocity decreases b) frequency remains same c) wavelength decreases d) all of the above 7) A man at the bottom of the pool wants to signal to a person lying at the edge of the pool. The man should beam his water proof light a) Vertically Upwards b) At an angle to vertical which is equal to the critical angle c) at an angle to the vertical which is greater than critcal angle d) he can't signal

PHYSICS LIGHT

από
Εκτύπωση
Ενσωμάτωση

Κατάταξη

Οπτικό στυλ

Επιλογές

Αλλαγή προτύπου

Επαναφορά αυτόματα αποθηκευμένου: ;