Chiều một tia sáng từ không khí tới gặp mặt nước n=1,33 tại I dưới góc tới i. Xác định góc khúc xạ trong hai trường hợp sau a/ i=30*. B/ i=60*

In a load, the load is paralel to the shaft. n a. angular n b. thrust n c radial n d. none of the above

Which expression allows you to determine the mechanical advantage of an inclined plane? a. height of plane / input force b. length of plane / input force c. length of plane / height of plane d. height of plane / length of plane

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.