In this product image provided by Apple, a new iMac with 27-inch screen is shown. (AP Photo/Apple Inc.)

(AP) -- Apple Inc. updated its iMac desktop computer line Tuesday and introduced a mouse that responds to the touch of fingers instead of using buttons or scroll wheels.

Those were among the finishing touches on a holiday lineup Apple hopes will help maintain the momentum of the past several quarters, in which the company has grown stronger despite the economic downturn. On Monday, Apple reported its net income soared 47 percent from a year ago, sending shares up sharply in Tuesday trading.

The updated iMacs have bigger screens - 21.5 inches and 27 inches, compared with existing models' 20 inches and 24 inches. They also have speedier processors and better graphics. The least expensive model costs $1,199, the same as the past generation, but the top-of-the-line iMac is now $200 cheaper at $1,999.

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