Q1 State the laws of refraction of light . If the speed of light in vacuum is 3 × 10⁸ m/s , find the speed of light in a medium of absolute refractive index 1.5.
Q2 A concave lens has focal length of 20cm . At what distance from the lens should a 5cm tall object be placed so that it forms an image at 15cm from the lens ? Also , calculate the size of the image formed.
Q3 What is the relationship between the S.I unit of power of the lens and S.I unit of focal length ?
Q4 the absolute refractive index of benzene and kerosene are 1.50 and 1.44 respectively. What is the refractive index of benzene with respect to kerosene.
Q5 Define magnification . Explain why magnification is positive for virtual image and negative for real image ??
Q6 Find the position of an object , which when placed in front of a concave mirror of focal length 10cm produces a virtual image , which is twice the size of the object .
Q7 For an object placed at a distance of 20cm from the pole of the mirror , an image is formed , 40cm farther from the object on the same side.
a)What is the nature of the mirror ? Give reason for your answer.
b)Is the image real or virtual ? Give reason for your answer .
c)Draw a ray diagram to show the image formed.
d)Calculate the focal length of the mirror used.
Please answer all the questions . Please. Thank you in advance.